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When I click @originalcontent, it says the user doesn't exist.

I've been using google to find original sources of texts. I tried it on images aswell, which works sometimes, but not all the time.

Oops, let me find the correct name. I must have remembered it wrong.

@originalworks I was close, but close doesn't invoke the bot.

It might only work as the main comment. I've managed to invoke him elsewhere. Either his name or a ! instead of the @ is supposed to work.