Twitter, the app, will soon starting looking around your home screen to see which other apps are there. In a blog post, the microblogging platform is announcing App Graph, which is just their way of finding out which apps you have on your phone. Twitter won’t be looking at your messages, or checking on your activity; they just want to know what apps you have on your phone. The reason, admits Twitter, is advertising. The more data they have, the better their ad network becomes.