The free and open source social networking software, Elgg, has just been updated to version 1.1.
I've been working with Elgg since August, and I've seen many improvements. It is now faster, more stable, and ready for deployment. A lot of new plugins have been released, greatly enhancing its functionality.
I've been working on configurations and customizations to enhance its utility in the K12 environment. I hope to have a package in the near future.
I have scores of blog posts about elgg, useful plugins, and discussion of its use in the K12 environment on my blog
I'm very excited about this and would love to collaborate with others on its deployment in schools.