MediaWiki:Captchahelp-text

Web sites that accept postings from the public, like this wiki, are often abused by spammers who use automated tools to post their links to many sites. While these spam links can be removed, they are a significant nuisance. Since understanding and answering the given question is a task that's hard to automate, it will allow most real humans to make their posts while stopping most spammers and other robotic attackers.

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