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by joering1 5241 days ago
they do just not in a monetary form, but by letting you use their services for free. it cost more to run, for example Facebook site, than $1.
1 comments

that's true. but then again, how much would their service be worth without the user's generated content?
How much would their service be worth to you without other user's generated content? If it's more important to you to see other people's content than you putting out your content, then you should be the one paying them to access other's content.