Meet Google Buzz:
Buzz integrates Twitter, and Facebook type functionality into Gmail. With 176 million Gmail users, that makes Buzz potentially a big player in the social web.
Will it catch on? I don’t know. Maybe. Facebook e-mail sucks, mainly because it sucks, and also because it can’t reach outside Facebook.
I’m on Facebook but I only check it when somebody tells me (verbally or by e-mail), I’m just not that social I guess. So I guess I’ll get “Buzz” by being on Gmail, but I doubt I’ll use it.