As already mentioned above: their are probably not selling directly your information (in the sense of these days revelations), but they are selling their product because of your content. Simple network effect: the more people there are, the more valuable their application is, the more traction it gains toward new users, the more new users there are.
Making money through you. (Like all user-generated content websites)
That parently isn't the same as selling advertisers information. Nor is it the same as tracking and selling that to advertisers. It's entirely disingenuous to suggest so.
No, it's disingenuous to suggest YOUR content is unrelated to the value of THEIR product.
A reasonable analogy would be conferences, are you paying for the venue, or the access to other people/speakers? does that mean the people/speakers are the product?
My contribution being of value to the site is one thing. Tracking that contribution and using it to target advertising is a completely different thing. Suggesting otherwise, as you and others appear to be doing, is deliberately disingenuous.
Making money through you. (Like all user-generated content websites)