I remember seeing a headline about Facebook being Bad For You because it causes cancer, a few days back. Unfortunately I was so busy with enrolment (& I might comment a bit on that in a separate post) that I didn't have time (or energy!) to chase it up. As I recall, the story had something to do with people sitting round all day chatting on Facebook, rather than going round doing 'healthy' things, & so leaving themselves open to cancer & other ills of the flesh.
And then today here I am, indulging in a pleasant spot of net-surfing, & I find that Ben Goldacre has done his usual excellent job of examining this claim, along with the related one that people who spend all their time on-line are more prone to loneliness, depression, & so on. For which it seems there is no convincing evidence, & in fact there are published studies which suggest no link exists.
So - visit Ben's place & read what he has to say. (You can watch/listen as well, as he's linked to a UK TV 'debate' on the subject. Great stuff.