Load up any SiftTalk or video post WITH comments like http://www.videosift.com/talk/Peak-hours-at-the-Sift-When-should-I-submit or http://www.videosift.com/video/Guinea-pigs-FLOOD-during-meal-time-at-a-zoo.

Click on a comment's avatar graphic/image. Note the link goes to user.php server. The code showed: ...a href ="//user.php?login=...

Seen in both SeaMonkey v1.1.2 and Internet Explorer v6.0 SP2. It doesn't matter if I am logged in or not. Yes, cleared caches too.