They come and go... I did get one to follow me for a little while, if my mouse happens to be quickly moving when it hits one of the links, it tries to follow my cursor ... not usually very far. I did notice that when I intentionally mouse over a link, there's a slight movement to it, like it's placing itself near the cursor location (instead of basing it off of the link's location) when it appears, so it may be related to that.

-tg