Most likely it's data miners. They'll see a discussion about a particular subject, say craftsman tools for instance, and next thing you know, you'll be getting ads for tool sales at Sears. On another board I frequent, a blues music board, I mentioned the time I saw one of those Large, Hairy, Creatures of Questionable Reality ( LHCQR) and the very next day someone from the Utah Association of people who investigate sightings of LHCQR joined that board just to send me a PM asking for details. I felt so violated. Everything we post on the internets is supposed to be private, right? :) :) :)