mytubo

3 A few kinks to work out, but good features

This is a pretty similar app to Instagram in terms of features - it has a community for photo-sharing, and takes square pictures with optional filters available.

It was my standard camera app for a while, but I had issues getting the Twitter sharing feature to work, and then I had to uninstall it because the camera was sideways. After that I couldn't get it to reinstall. Updates come out regularly, though, so it may be worth checking back soon.