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I remember reading somewhere that it doesn't pay much to put the Google adds inside a forum -, I'm new with adsense and I don't understand exactly why? I own a discussion forum (about travel, phpbb) which generates an average of 13 000 impressions per day. I thought it would be good to put adds in it.
The other reason forums don't pay is poor moderation and optimization.
I have found that a large blended rectangle unit at the top of the page, but beneath the masthead works exceptionally well. But it may have a negative effect on member growth. Putting a blended banner or leaderboard in that spot works about half as well but is less intrusive and presents less UI issues.
I remember reading somewhere that it doesn't pay much to put the Google adds inside a forum
With enough quality traffic and the right implementation, Adsense will work just about anywhere, even forums.
Google even posted 6 adsense tips for forums in their blog:
#6 is pretty important I think. It may make more sense to only show ads for non-members (non logged in guests) so they don't disrupt the community.
The forums that Adsense won't work on are those where the owner is measuring success by the number of posts per day, and hence encourages idle chatter, posting competitions and general low-content posts. But no other form of advertising will work there either.