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Yes, those spammers have been getting pretty annoying lately! Hopefully we've sorted the problem now, so there shouldn't be any spam on the forums. Unfortunately some of them do slip through the net, but we do have moderators on the forums who check for and delete spam daily - you'll be happy to see that everything has now been removed.
As for the self-promotion of books, we have just set up a place in the General Chat forum for members to promote their self-published books (see link below), rather than posting all over the place, so hopefully this will ensure that the forums stay filled with the content and chatter that they should be!