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New spam accounts are getting a bit out of hand.... I may need to either boost the CAPTCHA difficulty significantly or lock down new signups

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@freemo Your CAPTCHA should require that they write in LaTeX

@freemo simple math question (basic school level) will reject bots and unwanted people as well :)

@Rado1 The math question type captcha has been easier to circumvent than traditional ones for a long time now.

@freemo Turn on manually review to confirm an account.

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