Which is the best social networking site?

Question

I don't have a clue but which one is the best so far social networking site?
Is digg better than stumbleupon? I mean which of them all beings the most traffic. I am going to focus tomorrow on digg and stumbleupon to see some people there that have shouted to me to do some digging and I will see if it makes a difference to my traffic.
What do you think about buzz/ I have been buzzing people but don't know how to put the buzz widget on my blog. I am crap with that side of things.

Answer 1

I think  digg is much better I think compared to SU. There are manny others as well. propeller, reddit are few to mention.

    When you wanna market on these sites you should pick the ones that are related to your niche.

Answer 2

StumbleUpon, Digg, and Mixx are my preferred social networks.