Maybe it's an age thing but Until Buzz came out, I thought Twitter was the stupidest thing to date. I now stand corrected. Whats the point? You have a phone, It's in your hand Just call the other "Lonely" person to see what he or she is doing.
Everybody today want's to be connected, but only if it's anonymous and virtual. It's like I tell my kids - Put down the Computer and go outside. The "Cool / Fun" stuff you are reading about on your "Friends" - Tweets, Walls, Spaces etc. They are presumably and hopefully doing in real life. Don't you want to be a part of that?
Of course the Avg. teen and 20 something has 700+ "Friends" on their Social Networking site of choice, Which is odd in and of itself, because most of them never leave the dam house!
With that said, The "Near me Now" Feature that you get with Google in 2.0 and is included or part of buzz, albeit in a butchered format could be of minimal use. If it works as advertised.