While browsing Reddit today I discovered Simplifeed, a sleek new open source social network created by Dominic McPhee, and after playing around with it far a little bit I have to say that it is great so far.
Simplifeed is an elegant and simplistic service which is currently in alpha and distributed under the GPLv3 license.
You can download the source code from GitHub, or create an account on the site and check it out for yourself.
Comments?