Well community sites and forums and such are not something I'd count to the 2.0. So skipping those ...
Flickr? Even if it's sort of social, I'd still file it under my 1.0.
Digg? usually classified as 2.0, but boring .. I pass there once every 6 months or so.
Myspace? Created a profile, never bothered to update anything. Like the hotmail of the blogosphere. And no, Tom is NOT my friend. Way too many emos and flashy icons and annoying musics, and doesn't even properly work in my browser. No thanks.
So the only one I really bother to use is
LinkedIn but that to keep in touch with people who change companies, or people from work, studies etc. So there is not a reason to go there daily but casually.
Someone hinted Facebook would be way more popular in some parts of Europe. So I signed up .. to keep in touch with people from work etc after they or I have changed companies, and for those who aren't in LinkedIn.
Other than that .. hmm. 1.0 will do. Forums and flickr and everything else is still there ...
Or hm.. blogs are not as themselves on the 2.0 .. but if i RSS them are they then ... ?