A friend of mine and I were bit by SomeoneLikesYou in the last week. The scam is elegant in its simplicity. The site teases you with an email claiming to know someone who likes you, then makes you guess who it might be by submitting their email address(es). Each of those addresses receives a teaser email just like yours. Rinse, repeat. I ignored the message -- obviously a fake; I couldn't possibly be anyone's crush :-) -- but my friend took the bait and fed it some demographic data and email addresses. Once she realized what was going on, she wrote to everyone apologizing for any spam they may have received. She also sent a nastygram to the site's operators.
It should be pointed out that there is no proof that SomeoneLikesYou is doing anything nefarious with the data they're collecting. However, their credibility is not strengthened by their faked WHOIS records and their meaningless doubletalk on privacy issues (the declaration, "We send precisely zero e-mail advertisements," says nothing about the behavior of their partners/affiliates.)"