How does sites like facebook and google make money besides ads?

Hey how does a site like facebook and google for that matter make money. Obviously ads arent enough money to cover all there bills. Like how do they get the means to pay there bills and expand, even earn a positive cash flow?

It is pretty much ads,, i never see them though, i have ad block plus. ~

How to Make Money With Google Adsense For Free by Rhandell Mitchell

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