ahh, yes they do. you forgot Amazon btw.
However, a growing segment of the internet hates ads enough that they're willing to pay membership fees, or donate to sites they enjoy, or use small-time affiliate programs that their favorite sites partner with.
I mean, do you ever click on an ad willingly? I almost NEVER do--but then, I'm not their target market anyway 'cause I'm on here talking about opting out of it all ;)
I don't click ads either, and perhaps what you say is true but I was just stating the fact that they own online advertising. I never thought of Amazon as being a big player in online advertising, they are certainly a small player compared to FB and GOOG.