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What about Facebook, which not only has 1 billion users, but owns WhatsApp and Instagram, 2 of their largest competitors. In terms of dollars, given most other social networks aren't really monetizing yet, I'm guessing Facebook's market share would be >90%.

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Yes, but being a monopoly isn't, by itself, bad. You have to be abusing that monopoly to harm consumers.

Not saying that Facebook isn't harming consumers, just that that harm isn't necessarily related to their monopoly position.

Twitter and Linkedin are huge competitors.

Twitter maybe, but LinkedIn really isn't, unless you define the market to be "connecting anybody with anybody else on the Internet".

The market is selling ads. I thought that was pretty plain.

You should look into LinkedIn's revenue sources. Ads are actually a smaller part of the pie.

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