They make money through demographic targeted advertising. If you try out the process to set up an ad, you'll notice that, as an advertiser, you never receive anyone's personal information. That seems in keeping with the points above.
Actually, they are known for making it pretty hard on advertisers. They're rules for what ads are acceptable are pretty strict, to the point where showing almost anything other than just a plain description of your product/service can be interpreted to break the rules.
Most ads that you submit get rejected on sight, but if you post the same exacting thing at another type of day it gets through.
Mainly their ad platform is surviving because the sheer volume of impressions they can serve is hard to ignore. Other than that, they damn sure aren't making it easy for advertisers to give them money.
I guess they don't actually give advertisers your information, the way the point is written. Advertisers target and they match to people in the target, as good as giving information, just not that way it's worded.
