This past April Fools' Day, anyone and everyone with an Internet connection got Rick Roll'd. Websites roll'd their readers. The Techno Viking roll'd his Rocky Horror Techno Show.
Think of it as RickRolling meets To Catch a Predator. The FBI now puts fake links to child porn on message boards, and then arrests people who click on them.
The tactic has been used to convict people in various states already.