Here's how it works:
1. Comment with your username!
2. Post a link to your comment here on your own LJ, so that your friends will know where to find you!
3. Your friends will reply to your comment with reasons why they adore you, and then they'll repeat step #2 for themselves. And it'll keep going and going until everyone's feelin' the love!
So. I've turned off IP logging. You don't have to go anon, but that's what makes it fun. ;) Whether or not you reply to your anon comments is entirely up to you. Please join in then spread the word -- the more the merrier!
ETA: You don't have to log out to comment anonymously! When the little reply box opens up, click on "More Options". That will take you to a separate page. Then just choose "anonymous".
ETA #2: I've seen quite a few unthreaded replies. Make sure you click on the small "reply to this" instead of "post a new comment" -- otherwise, the person you're complimenting won't know you've said anything. (And the rest of us won't know who you're talking about!)