My best social network is facebook. Most of my friends don't use Gmail or twitter, but all but one of them are on facebook. I can only assume this is the norm

My best social network is facebook. Most of my friends don't use Gmail or twitter, but all but one of them are on facebook. I can only assume this is the norm rather than the exception. Certain groups of people might find Buzz useful, but I'm sure more won't than even those who don't find twitter useful (at least twitter has more famous people on it that others can follow).