If Elizabeth Warren were right that Facebook stifles innovation and should be broken up, startup investors would agree with her. They both (a) understand startups, and (b) have the most to lose if incumbents kill the up and coming ones. But on the whole they don't agree with her.
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Google and FB are harmful to startups where they compete with them, mostly helpful where they don't compete.
Google and FB can be pretty harmful without competing. When they're your vendor for advertising they certainly extract their pound of flesh.
