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1301, to be more precise.

Including you, and now me saying that it should be 1300, but with my answer it is in fact 1301 :D

No, GGP didn't count himself, GP pointed that out and also did count himself, so 1301 was correct, but now we're at 1303.

Point of clarification: is the father of the first user actually a GNU/Linux user?

Well he also uses the GNU/Lightbulb, so that's a yes