personally I have never known a good enough reason to 'follow' anyone on twitter...
Out of 1,000 tweets with the #worldcup hashtag during the game, only 16 percent were legitimate news and 7.6 percent were deemed 'legitimate conversation' — which leaves 6 percent spam, 24 percent self-promotion, about 17 percent re-tweets, and a whopping 29 percent of useless observation
I also choose what bits of information I share with my friends and family, and keep in touch with those I want to keep in touch with. People who know me know i don't like Facebook and will not find any information about me there.
It is a marketers dream with search engines trawling through peoples pages collecting information to create marketing results... or worse.
There are often burglarys committed due to twitters and facebook entrys saying they are going on holiday, if not done by their owners, but by their children, friends, work colleagues....
... never mind the perverts that follow young peoples pages.... never mind the one in twenty facebook pages that contain viruses\trojans\spyware...
... if you can't tell already, I am not a fan!