Health risks and Facebook?

I have heard a lot of crazy ideas about what can and cannot cause cancer. This is possibly the silliest that I have come across.

How using Facebook could raise your risk of cancer | Mail Online:
Social networking sites such as Facebook could raise your risk of serious health problems by reducing levels of face-to-face contact, a doctor claims.

Emailing people rather than meeting up with them may have wide-ranging biological effects, said psychologist Dr Aric Sigman.

Increased isolation could alter the way genes work and upset immune responses, hormone levels and the function of arteries. It could also impair mental performance.