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Agreed. I always install mine on the primary domain. Usually mydomain.com/news or mydomain.com/blog.

Completely agree with Cesar. I also feel the need to explain the context in which they could be harmful. Some spammy article sites would use tool tip type functionality to display adverts when a user hovers over particular keywords. In the past I've found this really annoying, but what your suggesting sounds like a helpful resource. However I would be very careful with the implementation and ensure it does turn out to be a helpful gadget and not a hindrance. Best of luck with it. Aran