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This is why I think it's a huge shame we moved to using real names and no alt accounts online. No more space to experiment.

That's very true on Facebook, and it's true that Facebook is the dominant online destination so far as numbers go.

There are still regular old forums for a lot of hobbies and interests though, and even on here people can use handles. Reddit and Twitter as well.

I will confess to having multiple alt accounts on Facebook.

There is room to experiment still.