1. Initial Launch: OMG! Cool. Signup
2. More people Jump in, it becomes even more exciting.
3. Everyone starts using it.
4. Eventually, excitement starts to fade away.
5. It becomes boring.
6. People's addiction eventually starts to decline.
7. People totally lose their interest.
8. Eventually, it becomes a ghost town. End.
Google+ even couldn’t pass through the 2nd phase.