Inter-user chat and commenting for Notes
This is cool! We now have real-time updates in Notes as we edit delete or create notes. Let's now take it to the next level and implement something akin to inter-user chatting.
It's possible to pivot our Notes application concept and take it in the direction of a social network. In the majority of such networks, users post things (notes, pictures, videos, and so on), and other users comment on those things. Done well, these basic elements can develop a large community of people sharing notes with each other. While the Notes application is kind of a toy, it's not too terribly far from being a basic social network. Commenting the way we will do now is a tiny step in that direction.
On each note page, we'll have an area to display messages from Notes users. Each message will show the username, a timestamp, and their message. We'll also need a method for users to post a message, and we'll also allow users to delete messages.
Each of those operations will...
