I don't think so to predict any social media platform as a best because all of them has their own importance like facebook, twitter, Google+ etc. By the way as Google point of view twitter has more traffic and peoples attraction as compare to facebook and it shows from their PR.
For generating traffic you can use both Facebook and twitter.However different features of Facebook like their PPC program,groups giving you more opportunity of driving traffic than any other social media.
Linkedin groups are a good way to start participating and posting to people outside of your friends list or followers.
Facebook and twitter are on top at the moment. Don't know whether YouTube falls in this category, but it can be a huge source of traffic too. And yeah, watch out for Google+...
I could say that as of this moment Facebook is very popular social networking site but don't miss the Pinterest because this is also a good networking site.
All the places mentioned above are awesome. Recently became aware that an info graph showing the type of visitors and demographics each one of these sites attract. Check out this article from http://mashable.com/2012/03/09/social-media-demographics/ and depending on your niche and target audience, use the appropriate one. Good luck
Hello there, In terms of traffic generation i'll reckon Twitter and Digg.com, these are good sites for traffic generation.cheers!
If you have a professional/business related product, then linkedin is a good way to network and create some brand awareness.
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I am really starting to use LinkedIn a lot, but of course it all depend on your goals and to what you are driving traffic. The best advice I'd say is there is no best one, but use multiple social networks to build a strong online presence. Choose a number of core networks and use the strengths of each to make up for the weaknesses of the others.