Late on Monday, a lot of Russian ICQ users got sent this message:

If you've been using ICQ for a while or are even remotely security savvy, you know not to just click on links that get sent to you, even if they appear to come from a known contact. Instead, you're going to try and check in some way whether it's really a person who sent you the link, or just a bot. Turing tests are designed to distinguish humans from bots, and everyone's come across CAPTCHAs, a reverse Turing test. Of course, if you're on ICQ, you're not going to use an image to check who's on the other side of the screen, but you can ask a challenge question – after all, a computer can't actually answer questions, can it?