Re: Maybe I missed it...
Apparently you did. or did you imagine that the internet was for you/us. If you go back to the early day of broadcasting Radio stations saw the entertainment (content) saw their way to make money was to "sell families to advertisers". Here in Europe we had a public broadcast ethos that carried into the TV age that did not have adverts.
The only reason that anything like Facebook starts free/without advertising is to build a hooked user base and because they are US based in order to be able to shrug off copyright challenges historically internet businesses built on user generated content could use the fact that they were providing "public benefit" out of the goodness of their collective expressly non-evil hearts for leverage in such challenges. That is also why they want to graft a fair use doctrine on every ones copyright system.
Eventually all the nice free stuff ends and people squeal "no fair". Well actual it was never free because users were already generating the all important content with their time, interaction and their intellectual property.