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Does the Facebook Sign In process prevent some potential spamming bots ? Should I put a captcha before allowing a Facebook Sign In process?
从理论上讲，您可以破解任何验证码。但随着验证码变得越来越复杂，破解它变得越来越难。它将防止无法破解验证码的人制作垃圾邮件，我相当肯定像 Facebook 这样的公司确实有很好的验证码。