App.net is still in its infancy as a new version of Twitter that you have to pay to get into but lacks issues like cutting developers off at the knees, and now it's starting to grow some legs. There are a number of apps in various stages of beta development. One of those apps is (was) Jive, which is now available for free in Google Play.
The two screen shots you see above are pretty much it. You get timeline views, and you can post to your stream. Simple, but effective, but also without the scope that Twitter continues to dominate with.
But these things do have to start slowly. If you're getting into App.net, give Hooha a look-see.