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World of Warcraft guild sites
Just found this out today.
About 80% of all guild websites use "Guild Portal" or something very similiar. The popup window for raid sign ups is infact html capable! Set yourself to have a note and you can screw with the page, add links, make huge font, even maraquee. If you dont use any text it will show as though you don't have a comment so its pretty untracable.
I'm having trouble with anything script or redirect related atm, would really be great to get it working. If anyone wants to give it a shot,