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https://dev.twitter.com/terms/geo-developer-guidelines

I think it only shows the tweets with locations turned on.

That is correct, it uses both the coordinates and places fields (see more about those here https://dev.twitter.com/docs/platform-objects/tweets ). There were actually substantially less before adding the code to handle "place". Most tweets that are tagged with a place and not specific coordinates use a bounding box which I've handled by just dropping the pin in the middle of the box.

That's a gem. It filters on tweets having some sort of geographic information on them. Without that filter there are multitudes more.

And this one from France: "@TimotheDcI : Fuck Louis XIV, Louis XVI , Paix a Louis Vuitton !"