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@profdc9 @gp

Market definitions of social media exist. They are present in the antitrust investigations into Facebook in the EU, UK and USA, as well as the private and public litigation that followed from those investigations.

Some definitional questions are, indeed, difficult.

This one isn't.

As to whether it's "sufficient to justify regulation," this question is also already settled, in that the EU passed the DMA and DSA with broad support, two years ago.