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Of course competitors already knew that. But this is not the difficult bit in building a competitor. The difficult bit is to make people switch en masse.

• century19 3y ago
  100% He opened up the arena.
• rsynnott 3y ago
  Elon, of course, was helpfully assisted with the difficult bit, too. If Facebook had launched a twitter-y thing two years ago, I think the general view would have been “oh, cool, it’ll probably be just as popular as Facebook Dating”.