Facebook, Twitter, and LinkedIn are the top three, I think. Of course, what really matters is the results. The best site for networking may be the least known if it increases your sales.
Just trying to get rid of them. Knowingly or unknowingly, I opened too many social accounts and now closing them and plan to keep only 1 or 2. As regards to the query, I believe Facebook and Orkut is the market demand.
Currently Facebook is leading with lots of unique and interesting features.. I am curious to see some other sites better than facebook
Facebook is the best choice, as it's the biggest site in the world. You can do whatever you like on Facebook.