"Everyone has had it happen to them: a "friend" sends you a link in IM or over IRC that purports to be something like a cat in an awkward position with a hilarious caption. Soon, however, you discover that the link wasn't to a lolcat at all; instead, you've been Rick Rolled?or even worse, sent to 2girls1cup (find it on your own, but be warned: it may scar you for life). These pranks are commonplace now, but be careful of what you click on and from whom. If that link points to anything even pretending to be child porn, that's enough evidence for the FBI of intent to download it. The authorities could then raid your home and possibly throw you in jail. No joke, it just takes one click and you're under intense suspicion."
http://arstechnica.com/news.ars/post...-says-fbi.html