Just got the news from Six Apart’s Twitter status:
Motion, a new free social application for Movable Type (think FriendFeed meets Tumblr & Pownce) is now in beta! http://icanhaz.com/MTMotion

After acquiring Pownce, Six Apart launched a new social application called Motion. Go to Motion application page at http://movabletype.com/motion/ for more details. This works together with Movable Type Pro. On its product page, Six Apart explains:
We looked at the most compelling social sites across the web, from Twitter to Tumblr, Pownce to FriendFeed, and more. And then we built an application around open standards to offer you the best features of each of these services, on your own site. (source)
I haven’t learned further about this new application, but this might be a solution for those who want to run a community-based website/blogs, or even a personal blogger. And, what makes it even better is that it also works — can be integrated — with other publishing platform. Read the FAQ page.
If you’re interested about Motion, here are some resources/pages to get started.