An interesting thing we noticed last year was that a few accounts which spammed apparent "exploitative" language were actually hacked accounts.
An account would post normally for a number of years, and abruptly change it's behavior, and start behaving in an automated fashion.
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That is another thing which makes me seriously doubt that spying on everyone with a Chat Stasi would be helpful (asides from other caveats which should be abundantly clear at this point).
