Ironically, the whole advertising system is set up to identify the viewer to the advertiser, not the other way round.

I built my own "opt in" by watching the status bar for slow loading sites and using the DOM inspector on visually annoying ads, then adding the host to my hosts file. It's very short: basically just google, doubleclick, outbrain, taboola.

http://pastebin.com/YAbJHe5j