Social networking
An array of social networking applications exist in the App Stores today and the new use cases are being tested each day. These applications let friends, acquaintances, neighbors, colleagues, and people with special interests share, collaborate, and essentially keep in touch with each other. Some successful examples include Facebook, Twitter, Pinterest, Google Hangout, and LinkedIn.
Social networks work as graphs of networks linking entities together. Any bad node in the graph has the potential to spam or infect the other node. In the following figure, the message between nodes A and B is intercepted and changed with spam. This will result in all nodes connected to B to be infected. This continues and as you can imagine will spread across nodes very quickly:
The biggest challenge with social networking applications is that of privacy. First, users have to be mindful of what they share with their contacts. In most cases, users are using their real name and other private information...
