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Prevent User-Generated Spam on Your Site | Google Search Central | Documentation

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Spammers often take advantage of open comment forms and other user generated content inputs and generate spammy content on an unsuspecting victim site. Hosting platforms may be similarly open to abuse; spammers may create a large number of sites that violate our spam policies and add little or no value to the web.

Preventing abuse on your platform or site is usually not hard. Even simple deterrents such as an unusual challenge users have to complete before interacting with your property may discourage spammers.

Publish a clear abuse policy and communicate it to your users, for example during the sign-up process. Furthermore, allow trusted users to report content on your property that they consider spammy.

Keep a record of signups and other user interactions with your platform, and try to identify typical spam patterns, such as:

• Form completion time
• Number of requests sent from the same IP address range
• User agents used during signup
• User names or other form-submitted values chosen during signup

These signals may help you create a user reputation system, which can not only help you engage users, but it can also help identify spammers. Since many comment spammers want their content in search engines, consider adding the noindex robots meta tag on posts that come from new users that don't have any reputation on your platform. Then, after some time, when the user gains reputation, you can allow their content to be indexed. This will greatly demotivate spammers from interacting with your platform.

Since oftentimes spammers are motivated by leaving a link to their site, consider adding a nofollow or ugc rel attribute to all links in untrusted content.

Manual approval (or moderation) for certain user interactions can decrease spam on your platform considerably by preventing spammers to instantly create content that may be spam. Moderation adds overhead to your daily workflows, however it's a very effective way of fighting spam. Its efficacy is why, for example, comment moderation is a built-in feature in most CMSes.

Once you find a single spammy profile, make it simple to remove any others. For example, if you see several spammy profiles coming from the same IP address, you can add that IP address to a permanent ban list. For CMSes (for example, WordPress), there are plugins like Akismet that can help, but adding the IP address to your firewall's deny list can be very effective also.

In your sign-up form, consider using reCAPTCHAs or similar verification tools to only allow human submissions and prevent automated scripts from generating a lot of sites on your hosting service.

• Monitor your property for spam signals such as redirects, large numbers of ad sections, certain spammy keywords, and large sections of encoded JavaScript code. The site: search operator or Google Alerts can help detect problems.
• Keep an eye on your webserver log files for sudden traffic spikes.
• Monitor your property for phishing and malware-infected pages. For example, you can use the Google Safe Browsing API to regularly test URLs from your service.
• Come up with a few confidence checks. For example, if you're mainly targeting users in Japan, what are the odds of thousands of user interactions from an Italian IP overnight on your property? A number of tools are available to detect the language of newly created sites—for example language detection libraries or the Google Translate API v2.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-02-04 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-02-04 UTC."],[[["Prevent user-generated spam by implementing deterrents like user challenges and clear abuse policies that include reporting mechanisms for trusted users."],["Identify spam patterns through analyzing user data such as form completion time, IP addresses, user agents, and usernames to establish a reputation system and potentially employ the `noindex` tag for new users."],["Implement manual approval for suspicious interactions and utilize blocklists based on spammy profiles and IP addresses to prevent repetitive spam attempts."],["Utilize CAPTCHAs and similar tools to deter automated account creation and actively monitor your service for spam indicators, including traffic spikes, phishing, malware, and suspicious user activity from unexpected locations."]]],["To prevent spam, establish clear abuse policies and allow users to report spam. Identify spam patterns like form completion time, IP address, and user agents to create a user reputation system. Add `noindex` to new user content, and `nofollow` or `ugc` to untrusted links. Use manual approval for suspicious interactions. Block known spammers by IP address and prevent automated sign-ups with verification tools. Monitor for spam signals, traffic spikes, and phishing using tools like the Google Safe Browsing API.\n"]]

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