Sorry for the snarky comment, I just had to. As other commenters have pointed out, we are entering into the age of "online personna warfare" -- which in my mind could end up spawning true AI since the monetary stakes are so high, as annoying as it all is right now.
Brain-teaser question: if you had a hundred friends online, and they all knew you and joked with you and provided support when you were having a bad day, asked about your family, etc. -- as long as they blatantly did not try to sell you anything, perhaps just mentioning a product every few months as part of a normal conversation, would it really matter if they were robots?
Product placement is going to go from actors in movies to robots on internet sites. Right now it's just happening in a very klunky and annoying fashion, but it'll get smoother. Very strange times we live in.