Today we've added the ability to tag users. User Tagging is available to all users that are level 20 and higher. Simply click on a user's info page and you can tag them with up to 30 characters. These tags are visible only to you personally so no one else can see what you have tagged other users as.
You can manage all of the tags that you have made from your own info page. We are currently allowing users to create a maximum of 20kb worth of tags, which we would imagine is more than enough for the average user. --- Um, not to criticize science or anything, but wouldn't it be easier just to call it "the pink one"?