Let's not forget about the creepy targeted ads that are mostly useless. After I buy a product, I see ads for it. That's a complete waste of time and bandwidth. The people pushing this crap are idiots, they only want to make a buck at someone else's expense, and there's no question of "ethics"---it's an invasion of privacy and I feel perfectly happy blocking ads and never visiting websites that push such garbage. There are many sites that operate on a "user-supported" basis, where you can choose to pay them directly in exchange for never seeing an ad. I donate to sites that I use and like. There is no need for ads.