Tent is at least equally proven. I'm following 157 people (maybe ~50 are consistently active users). Within only a few months of existence, Tent has attracted development of an Android app[1], two iOS apps in beta[2], a very smooth and sleek OS X app[3], and several alternative webapps[4], all made by third-party developers with no relation to the startup that created the Tent protocol.

I don't mean to be rude or dismissive towards another open-social project, but I have been unimpressed with the design and usability of Identi.ca. OStatus seems to be the work of idealistic folks who hoped they could just make an open protocol and people would flock to it, solely because it was open. Predictably, that hasn't happened. Open is great, but software also needs to provide a great user experience. I think the Tent community gets this.

Tent is also more than a Twitter clone. It already supports private posts, long-form blogging and social bookmarking, unlike OStatus, and in the months ahead it will do much more.

[1] https://play.google.com/store/apps/details?id=com.monstarlab...

[2] http://signup.tentrapp.com/ and http://bivy.me/

[3] http://jabs.nu/Tentia/

[4] http://zelten.cc/, http://essayist.mndj.me/