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How to prevent spam on forums?

I have noticed that most forums get a large number of spam signups, who post junk on the forum. What is most effective method to prevent spammers from registering and posting on a forum, to control spam?
Cloudflare turnstile generally stops them and blocking the known spammers via IP blocker(waf) settings on cloudflare.
 
it is to use CAPTCHAs or reCAPTCHAs on registration and submission forms to deter bots.
Anti-spam Plugins can be installed as well.
recaptcha is not good hcaptcha is little better, otherwise use of cloudflare could also more protective way to avoid such kind of situations.
 
Spam can really hurt forum quality. The most effective way to prevent spam signups is using a combination of CAPTCHA during registration and email verification to ensure real users. Additionally, implementing moderation tools like user approval before posting and automated spam filters can help. Some forums also use reputation systems to limit new users’ posting abilities until they earn trust. Combining these methods usually keeps spam under control.
 
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