It's not so much the ads for me - though some recent ones that are clearly scams have been making the rounds here that facebook refuses to do anything about.

It's the whole tracking, data-gathering, and trying to optimize for squeezing the last bit of revenue out of people that I dislike.

That and the stupid amount of bandwidth and compute caused by the ad scripts on every other website. ublock makes the web so much faster, it's hard to believe.