It's also quite disconcerting to consider the implications of this. Since we 'opt in' to the articles we click on, tracking what individuals read and then building a profile based off of that would be quite informative, and quite invasive.
And then sharing, trading (to expand the profile), and selling it to other companies? Really nasty stuff.
And then sharing, trading (to expand the profile), and selling it to other companies? Really nasty stuff.