[StevenHodson]

excuse me for a second .... it might not be direct sharing with advertisers but the more that Facebook cons you into sharing the more valuable your information is to Facebook as a way for advertisers to target their ads. So in effect the more you share your information with a growing pool of people the more advertisers gain in the process. It might be indirect but you are still provide fodder for the marketers and advertisers.

[ivankirigin]

The quoted statement is false. You could have everything public, or everything shared with friends only, and it wouldn't matter with respect to advertisers.

Yes, facebook benefits if you share more on facebook. Similarly, every other website on the planet benefits more if you use it more.

A common idea is that facebook makes decisions based upon making money from advertising. Here, the accusation is that facebook is pushing people to be more public because of advertising money. First, facebook doesn't make decisions based upon short term monetary gain. Second, this is explicitly false, as I've already outlined.