There is a psychological factor to this that is used by games as well. People get addicted to collecting things whether they be tweets, comments, etc. I highly

There is a psychological factor to this that is used by games as well. People get addicted to collecting things whether they be tweets, comments, etc. I highly recommend Amy Jo Kim's video where she shows examples of this across several social apps: http://www.youtube.com/watch?v=ihUt-163gZI http://www.youtube.com/watch?v=ihUt-163gZI