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Google Search has continued to provide a service that has improved over time but kept its simplistic model approach so users continues to go back them. Other models like Yahoo, Bing, AOL, etc did not work because they never took the time to understand what typical users want. Google search made it easy for people.
As for Facebook, I've seen many people complain about the different changes in layout of their service.
Facebook doesn't have to diversify their revenue stream but they at least have to expand it to justify its valuation.
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