More amazing to me is the ads I don't see after I've searched for something. EX: I was looking for audio components, found some good sites, and those sites pop up as ads when I look at BF or other BB websites. But when I look for (controversial topic and products) I won't see ads for those next time I'm on BF.

No,, its not 'pRon', it is totally legal and lots of people use the products.