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https://www.zdnet.com/article/google-plus-deleting-accounts-en-masse-no-clear-answers/ Early on, one of the rules was that you had to use your real name for your Google+ account; then they changed it to letting you use pseudonyms, but only if you could prove that you were know by said pseudonyms...

I didn't like how it basically forced you to tie your real identity into your Youtube account, making it impossible to post videos anonymously.