Imzy was a nice place to be.
Some of the problems I had:
1) The interface was confusing. Making posts was confusing.
2) Users were allowed to create communities, and they did. There were a gajillion of very tiny communities. This fragments the userbase and makes each tiny community seem dead.
3) Not enough users. Seriously, seeding the community with posts is a good thing. It sets tone and gives people something to interact with. If you're a startup in this space you need to hire a few people on minimum wage and get them to spend 9 hours a day making posts on different accounts.
It's a shame to see it go.