Elgg 1.8 Social Networking: Create, customize, and deploy your very own social networking site with Elgg with this book and ebook

A profile lets users describe who they are. It can be as simple as a name and a few vital statistics such as location and age or as elaborate as a complete listing of a user's background, likes, dislikes, and interests. A profile usually includes a photo (often called an avatar) that represents the user throughout the site.

Social sites often let you "friend" or "follow" other users. These relationships define who is in your social network and are often used to control access to content. For example, a user may set the permissions on a photo so that only friends may see it.

Many social sites focus on sharing content; think Flickr, YouTube, or Blogger. People not only share photos, videos, blogs, and files, but they also comment, rate, and recommend.

With all this sharing and commenting, people need a way to keep track of what is important to them. An activity stream that displays the latest activity relevant to a user is one technique. A good example of this is the news feed in Facebook. E-mail notifications are another common method for staying updated on what is happening.

Not only do people form relationships with other users, but they also join groups organized around shared interests or purposes. These groups often mirror the communities that people join outside of the virtual world of the web: alumni groups, sports fans, book clubs, and charities. Social websites enable these groups to form and thrive regardless of the location of the members.

Social interaction on these websites is not limited to commenting and sharing content. Encouraging communication between users is another important attribute—whether in public such as a message board or discussion forum or in private with real-time chat or e-mail-like messaging.

These are the types of features that are expected in today's websites. This expectation has created a demand for frameworks and web applications that provide social functionality. Solutions range from hosted social networking sites from providers such as Ning, to sets of plugins that extend content management systems such as Drupal and WordPress, to full application frameworks focused on social networking such as Elgg. The end result is that it is easier than ever to create custom social networking websites.

The Elgg engine handles basic user account creation and management. Registration, logging in, password resets, and e-mail address changes are all handled for you by the engine. Elgg also supports external authentication so that sites can integrate user accounts with other services. For example, there are plugins available that use this capability to enable users to log in with their credentials from Facebook or Twitter.

Users want to control who has access to their data and the Elgg engine does this through a granular permission system. Every piece of content in Elgg has an access level assigned to it. It could be a blog post, a video, or an individual profile element. The engine gives users tremendous flexibility in who can see their data through simple privacy controls and custom access lists.

The engine has all the hooks so that you can do anything from tweaking the default theme to writing a completely new one. You have control over every line of HTML, every layout, every CSS statement. Chapter 9, Theming Elgg describes how to theme Elgg.

It is no fun to share your latest vacation photos without people commenting on them. Elgg has a built-in commenting system that can be applied to any content in the system, whether blogs, bookmarks, or videos. This is great for plugin authors because they do not have to write any code to handle comments. It is also good for you as the commenting system looks and works the same way throughout the site.

A feature common to social sites is tagging. Tags are keywords attached to content. When you click on a tag, it shows you all the content that shares that keyword. Elgg has a common interface for tagging content—whether blog posts, files, or a user's profile. The engine also makes it easy to create tag clouds.

Widgets are draggable, customizable components that are often found on web portals such as iGoogle or My Yahoo!. Many of the plugins that are distributed with Elgg have their own widgets that can be placed on a user's profile page. The widgets display members' latest blog posts, who they are friends with, or what groups they have joined. Most social media sites provide bits of JavaScript that can be used to create new widgets within Elgg. For example, there is a widget that displays a user's latest tweets from Twitter.

Your users may not all speak the same language and you might want your site to support their native languages. The Elgg engine can load different language files based on user preference. By default, Elgg's engine and the bundled plugins come with English language files. People in the Elgg community have created translations for languages ranging from German to Chinese to Basque.

A challenge for any social site is how to keep people coming back. E-mail notification is one popular technique that Elgg supports. Another option is providing RSS feeds so that users can monitor activity on your site. The Elgg engine can turn almost any page into a RSS feed. Do you want site-wide activity? There is a feed for that. How about the latest posts in a group forum? There is a feed for that. Looking to stay updated on the newest comments on a blog post? There is a feed for that, too. Just look for the orange feed icon at the top of the sidebar menu or in your web browser's location bar.

A majority of Twitter's traffic comes from desktop and mobile clients. How does this work? Twitter provides a web services API so developers can write applications such as TweetDeck, which interfaces with Twitter. The applications can pull the latest tweets out of Twitter and can post new tweets for the user. Elgg has a framework for building web services APIs much like those of Twitter or Flickr. Think of all the possibilities: desktop clients for notifications, mobile clients for sharing photos, mashups that use your site's data.

Elgg is distributed with a set of plugins which are written and supported by the Elgg development team. These are called the bundled plugins. These plugins provide enough functionality to run a basic social networking site and are a good demonstration of what is possible using Elgg's plugin system.

The bundled plugins provide a wide range of functionality. Included are content sharing plugins such as blogging, social bookmarking, and file sharing. There are plugins for user profiles, activity streams, groups, and notifications. Integration with Twitter, private messaging, search, and administrative tools are also provided through these plugins. Detailed information on the bundled plugins is included in Chapter 3, A Tour of Your First Elgg Site, Chapter 4, Sharing Content, and Chapter 5, Communities, Collaboration, and Conversation.

As an open source project, Elgg has a community of developers who build plugins for their own use and then share them with other Elgg users. These plugins are referred to as third-party plugins and many are available from the plugin repository on the Elgg website (http://community.elgg.org/pg/plugins). Some of these plugins add significant functionality to Elgg such as a photo gallery or event calendar. Others extend a bundled plugin or customize an aspect of the Elgg engine. There are hundreds of third-party plugins available. Chapter 6, Finding and Using Plugins describes a few of the best and gives advice on how to select and test any plugin.

The look and feel of Elgg is controlled by the theme. Elgg comes with a default theme that you can use. It is not a separate module that can be uninstalled, but is built into the engine. To change the theme, you install a theme plugin that overrides parts or the entire default theme. Theme plugins are installed just like other plugins and have access to the same APIs. Chapter 9 provides information on where to find themes for download, describes the components of a theme, and includes a guide to creating your own.

You can build your own plugins to customize or extend Elgg. Writing a simple plugin requires either basic knowledge of (or the motivation and persistence to learn) both PHP and HTML. An example of a simple plugin is one that changes the word "blog" to "report" in the blog plugin's menus and page titles. Creating a plugin that does this is quite easy to write. There is a tutorial in Chapter 8, Customization Through Plugins that shows how this can be done.

A more complicated plugin is one that modifies how Elgg handles the creation of "friend" relationships. Elgg's default model is that any member can friend any other member without requiring a confirmation. A one-way relationship is formed, meaning that the fact that I am your friend does not imply that you are my friend. This is consistent with Twitter's model of followers. For your social networking application, you may want two-way relationships that require confirmation as Facebook does. The plugin would hook into Elgg's engine and change the relationship creation process. A reciprocal friendship plugin like this is available in the Elgg community plugin repository.

With the right development skills, you could also write a plugin that adds a significant new capability to Elgg or integrates Elgg with another open source web application. Elgg's plugin API is quite powerful so the only limitations to what you can build are your skills, time, and creativity.

James wants to create a social networking site for tango dancers around the world. He wants his users to be able to upload tango music and playlists. They can upload videos of tango dancing and rate them. Each city will have its own group where members can discuss tango related activities. The groups should have a calendar that lists the upcoming dances and a place for people to post photos of previous events. James also wants to pull in posts by tango bloggers from outside his site and redistribute them as a feed to make it easy for people to follow what people are saying in the community. He, of course, also wants a slick theme that elicits the emotion of the dance.

Imagine a theoretical company called Acme Corporation. Acme has deployed applications on their intranet to encourage collaboration among their employees. They are using MediaWiki as their wiki and Sharepoint for file sharing. Management and the employees are not satisfied with the current solution. They still feel that it is difficult to find the right person with the right expertise for a project, quickly organize ad hoc teams, or form communities of practice that cut across organizational boundaries. They need software to tie together the current intranet applications while providing the social functionality needed to address the mentioned limitations.

Mr. Harris teaches middle school history and wants to use collaborative technology for a group project idea that he has. He needs a web-based application that is simple to set up and requires minimal configuration. Mr. Harris wants the students to break up into teams, research a historical figure, and then create an online profile for that person. The profile will include biographical information along with status updates and blogs written from the perspective of the historical figure. He also wants the students to use the site to collect resources and collaborate on the writing process.

He decides the tools he needs are blogging, groups, bookmarking, and collaborative document editing. Another requirement is that the students need to be able to access it at home and school, but no one else on the Internet should be able to see the data. One last requirement is that it must be cheap—preferably free.

The Elgg community site (http://community.elgg.org) provides a place for Elgg users and developers to interact. There are group forums where people can ask questions and share expertise. The plugin repository at the community site has hundreds of plugins that have been contributed by developers.

A great place to go for documentation on Elgg is the wiki at http://docs.elgg.org. It covers the installation process, administering an Elgg site, and creating plugins using Elgg's API. The wiki also contains a list of sites based on Elgg which can provide inspiration on what is possible with Elgg. Remember that it is a wiki so you can add to it.

The Elgg project uses Trac for bug tracking and managing release milestones (http://trac.elgg.org). The latest development version of the code is found on Github (http://github.com/Elgg). For Elgg developer community communication, try out the Google group (http://groups.google.com/group/elgg-development) and the Elgg IRC channel: #elgg on Freenode. To keep up with the latest efforts of the Elgg development team, follow the blog at http://blog.elgg.org and the @elgg Twitter account.

As you work through the next few chapters, you will notice things that you would like to change or add. Jot those down in your notes so that when you are done, you have a list of possible customizations to prioritize.

As you try out Elgg, you are going to be using the resources listed above. You will find interesting tutorials or hints about Elgg that you won't need to use at that moment. Save links to those resources—whether through browser bookmarks or web-based sites such as Delicious. In addition, as you browse the Web, you are going to run across features or design elements that you really like on other sites. Save those, so they can serve as inspiration as you design your site.

It is tempting to go to the Elgg community site, download 10 or 20 plugins, and install all of them at once. This is not a good idea. If one of the plugins causes a problem with your site, you will not know which the bad one is. It is better to systematically install and test one plugin at a time. Chapter 6 walks you through the process of finding, installing, and configuring plugins.

Whether looking for guidance on how to do something or help fixing a problem, the best first stop is the Elgg wiki. Do a search there or check out the FAQs. If you do not find your answer, visit the Elgg community site. Search the forums to see if anyone has asked the same question before. If not, select the group that best matches your issue (often the Technical Support group) and ask your question. Be sure to use a descriptive title and provide plenty of details.