What social profiles rank best

I'm doing some orm and what to know what sites' profiles end up ranking best. Also what are some that you're using that are lesser known.

Currently I'm having success with:
Meetup
Google+
Twitter
Flickr
Slideshare
Quora


Tried and waiting for results
Stumble upon
Hunch
Digg
Delicious
Facebook
Linkedin
Big sight
Four square

What are some other good ones to try?

Thanks