Quite a bit - I get ads for septic tanks because I have looked at them several times and tank companies continue to advertise for me because I might buy. I get ads for robot mowers because, again, I looked at them. I still see "the bottom of the barrel" ads occasionally, but it's very rare. Ad blitzes on the other hand ... (no, I don't want to build an app just-by-thinking-about-it) ...