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Continue to ChatQuery : Usually moderation tools are built into the application/CMS you're using. If you're talking about automated spam-detection tools, then Akismet has a pretty good reputation for blocking spam on https://vmapp.org/query/75784/Usually-Moderation-Tools-Are-Built-Into-The-Application-CMS-You-Re-Using-If-You-Re-Talking-About-Automated-Spam-Detection-Tools-Then-Akismet-Has-A-Pretty-Good-Reputation-For-Blocking-Spam-On/