How Social Networking Sites and Search Engines earn revenue?

[Sumant]

How do the Social Networking Sites and Search Engines earn revenue?

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[LastWarrior]

How do the Social Networking Sites and Search Engines earn revenue?

They earn via online advertising.

[PolicyWala]

They earn mainly via ads like google via adsense and on facebook also has sponsored ads. But some websites also provide other add on services also.