Raindrop is a project of Mozilla Labs, which aims to create a unified messaging application and a social networks aggregator. It's in an early development stage, but still promising.
While I do see a current need for aggregation of centralized social network sites, I'm convinced distributed social networking will succeed at last. Raindrop might however be able to support this issue by offering a unified personal interface for social networking.
Since Ubuntu Karmic already comes with Pyhton and CouchDB, installing Raindrop is quite straightforward:
Raindrop does not yet offer a graphical configuration utility, so you will need a text editor.
Here's an example configuration file:
After you created a configuration, you might want to tell Raindrop to fetch your messages:
./run-raindrop.py sync-messages --max-age=5days
After the script finishes, you're able to have a look at your inbox:
A word of warning: Raindrop does currently not support desktop-couch. This means, every user on your PC is able to access your inbox via the given URL. So if you're running a multiuser system, be warned.