Theres way more crap on facebook than ads
I started using FB purity to restore the chronological ordering option after facebook removed it, getting rid of the ads and all the other elements of facebook that I had no interest in (trending, polls, etc) was a bonus, but now i'm used to it, i could see myself stepping away from the service if facebook managed to break it.
I use facebook to see what my friends are saying and view photos that they are sharing, and that remains all I want from it.