Big social networks put plenty of websites out of business - anyone can create a group, say, on Facebook, and it's much easier than to build and support whole website.
Now we want to get web-masters back into the game, arming them with the same functionality major social networks have.
The Micro is the simplest GRA4-powered Social Network. It can run on any PHP hosting (including free ones), and does not even require a database server.
Demo:
http://micro.ucq.me/gra4/activity
Free hosting...