Beowabbit

A form where people can list which of their LJ friends they have crushes on. The claimed theory seems to be that if people have a mutual crush, the site will tell them (but they reserve the right to publish the information). The last time one of these went around, though, the initial claim was that the site would just report statistics -- how many of your friends have a crush on you, that sort of thing -- and, I think, mutual crushes. Then a few months later the guy who set it up offered to sell anyone the lists of people that people had crushes on.

(here's an example of the latest incarnation, and here are ljmeme.com's scary terms of service.)