Just a couple of quick thoughts:
Design is 'meh', and off centered, which pains OCD people like myself.
Focus on one or two social networks (Facebook + Twitter would cover 90% of the people that would use this site).
The great thing about ThreeWords.me was it's simplicity. Type three words on the profile page, and done. Look at the site, and remove anything that doesn't -need- to be there for function or viral growth.
I don't use Facebook, so couldn't log in and check out the actual service. Just my thoughts from visiting the home page.