In the friends' shared items I have people who weren't there before. A lot of them. And they aren't using Google Reader at all (in the screenshot only a few are visible and some of them use Reader and share items).
http://img375.imageshack.us/img375/7671/greaderfriendska8.jpg
There are even some I choosed to hide from "manage friends".
Anyone else is having the same problem?

Nope, but I noticed that the favicon on the login page is different than that on the actual reader page, so that the favicon in my Bookmarks Toolbar changes all the time. :(