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Can I get rakeback after I have already registered for a site, and on what sites can I get rakeback on?
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It depends, but usually not, especially not FTP.
http://forumserver.twoplustwo.com/showfl...=0#Post10604918
This FAQ should have some answers for you
http://forumserver.twoplustwo.com/showfl...e=0#Post7510298
Try reading these forums
http://forumserver.twoplustwo.com/po...ack&page=0
http://forumserver.twoplustwo.com/po...akebacknetwork
http://forumserver.twoplustwo.com/po...=rakereduction
or just google rakeback and you will get dozens of sites offering rakeback on lots of different rooms.