Earlier quoted context omitted.
Sure. http://en.wikipedia.org/wiki/Facebook#Beacon The prime example that resulted in a lawsuit settlement. I mean really? Opt-in to reveal your purchasing and browsing habits with selected companies and then spam your friends? http://gawker.com/5426176/facebooks-great-betrayal Another opt-in that is equivalent to Facebook buying web coverage at the expense of user privacy. http://gigaom.com/2010/04/22/facebooks-inst…
The claim that facebook has changed defaults in order to indirectly make more advertising revenue is very different from the claim that checks were written to facebook in exchange for private user data. You implied the latter, and it's bogus. None of these programs involved facebook giving user data to advertisers. Even the dreaded Beacon was strictly one-way: it allowed sites elsewhere on the Web to publish to faceb…
Your argument is analogous to saying Microsoft didn't really have a monopoly because 3% of computers used Linux and OSX. Plus, how does F8 instant personalization work? I doubt it is solely based on a 1 pixel tracking image.
And I do hold up AdSense to the same level of scrutiny. While it also has privacy issues, it is not of the same level. It does not force browsers to become advertisers to their friends, revealing their purchasing and browsing habits. Your friends do not know that you visited a certain website or bought a certain product and can link you by your name, age, friends, and likes/dislikes and organizations you belong to.
That is the sole reason why people think Facebook can beat Google.