I think the reality is it is being done, not necessarily at the ISP level, but through snooping by the NSA. And done in massive amounts. Where everything we say in open forums - including this thread, which of course has put flags on our own usernames (which is fine by me, since the NSA can go #$%%) And heck, I fully expect my emails are illegally tracked as well. Its one of my on-going battles as a civil libertarian.