In the film Minority Report, we see that advertising in the future is triggered by iris scanners who identify you by eye pattern and use that to have talking billboards address you by name. Our present is getting closer and closer to that science fiction scenario!
The latest musing on Google+ is over at SEO Chat, which asks How Google Plus Could Change SEO. There’s a list of features which Google+ adds, each of which have the handy side effect of offering more targeted advertising.