For me also is Facebook. It is most social networking site uses world wide. It is very easy to use it that's why it is very popular.
Facebook is bettar than twitter & myspace because of its user friendly features. People trust on this site this is the main reason that this site has 500 million active users. Twitter and Myspace is also a very good social networking sites but in last you have to decide how you use these sites.
Demand is very high of Face Book.As we all agree with Face Book. This proves this is the best social networking site as per majority.
my vote is for Facebook for it is more easy to use for me.. though I both use facebook and twitter and often time myspace..
Facebook is the world wide known social network. to be honest I always open my facebook account daily
Facebook is the best social network right now. Most of the people I know switch from other social network to facebook. It provides users with great experience for gaming and even for marketing. It is also much faster than other social networking sites.
Facebook is the best social network but you need good content to keep your fans and visitors. For twitter you can get quick traffic but you need to build followers first
According to Alexa.com FaceBook is, According to Compete.com FaceBook is, according to Noah Rainey, FaceBook is.
there are lot of good social networking website available on the web and definitely facebook and twitter are just among. If you are asking this question in term of web traffic then both of site are equal to generate it.