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e.g. last names like "jumpycat", "Purple" etc.

I reminded of Catherina Fake, a Flickr co-founder.

As far as I know "Fake" is the surname that she was born with.

Yes that's my point. You have to be careful about "clearly pseudonymous accounts"

All right then. I'll give Tallulah von Strumpet-Hausen and Martin Soulstealer the benefit of the doubt ;)

if your point is "you don't actually know" then mine is "you don't need to even care".