This plugin hasn’t been tested with the latest 3 major releases of WordPress. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.



This is the plugin every WordPress Multisite or Buddypress admin has been waiting for! Announcing Anti-Splog, the ultimate plugin and service to stop and kill splogs in WordPress Multisite

This plugin goes way beyond any existing splog plugin for Multisite because at its core is the new Anti-Splog API service hosted at WPMU DEV Premium. This means that Anti-Splog not only prevents/limits bots, it also identifies human and existing spammers automatically and with great efficiency.

Four Layers of Protection

Anti-Splog works with four layers of protection to provide the ultimate in splog killing power. Up front we have 5 methods to choose from that can limit or stop those evil automated bots that are flooding your Multisite install with splogs. These can be fairly effective, but with our experience on sites like Edublogs, a large number of splogs are manually created. While every other splog prevention plugin stops here and leaves your site unprotected, ours goes 200% further.

If the splogger makes it past the initial roadblocks the plugin sends all their signup information to our API server, and we decide if it’s suspicious enough to mark the blog as spam right off the bat. The beauty of our Anti-Splog API service is that we crowdsource data of tens of thousands of splogs from Edublogs and other Anti-Splog users. If anyone else has run into that splogger or spam post you don’t have to worry about it on your site.

Sometimes our Anti-Splog service may not have enough information to mark a blog as spam right at signup. But not to worry, that’s when Anti-Splog pulls out its most potent (and amazing) weapon: Post monitoring. The second a splogger writes a spam post, no matter how cleverly disguised, our API service analyzes it and boom, that splog is shutdown. It’s hard to describe the utter satisfaction we get watching splogs destroyed every few minutes live before our eyes at Edublogs. Evil sploggers have finally met their match with Anti-Splog!

And if all that wasn’t enough, we include an incredibly well thought out moderation queue for blogs. When our API service returns a suspicious score that’s not high enough to auto spam, they get sent to the “Suspected Blogs” queue instead. From there you can monitor suspicious blogs until you know whether they are spam or not. When you are sure just mark them as spam or ignore them to remove them from the queue. Our API service will learn from every action you take, becoming more and more accurate.

Anti-Splog Features

  1. Signup Prevention – these measures are mainly to stop bots. User friendly error messages are shown to users if any of these prevent signup. They are all optional, require no API key and include:

    • Limiting the number of signups per IP per 24 hours – this can slow down human spammers too if the site clientele supports it.
    • Changing the signup page location every 24 hours – this is one of the most effective yet still user-friendly methods to stop bots dead.
    • Human tests – answering random user defined questions, picking the cat pics, or reCAPTCHA. (see screenshots)
    • Pattern MatchingNEW! checking site domains, titles, or usernames against your defined set of regular expressions.
  2. The API – when signup is complete (email activated) and a blog is first created, or when a user publishes a new post it will send all kinds of blog and signup info to our premium server where we will rate it based on our secret ever-tweaking logic. Our API will return a splog Certainty number (0%-100%). If that number is greater than the sensitivity preference you set in the settings (80% default) then the blog gets spammed. Since the blog was actually created, it will still show up in the super admin area (as spammed) so you can unspam later if there was a mistake (and our API will learn from that). Note that this service requires an API key.

  3. The Moderation Queue – for existing blogs or blogs that get past other filters, the queue provides an ongoing way to monitor blogs and spam or flag them as valid (ignore) them more easily as they are updated with new posts. Also if a user tries to visit a blog that has been spammed, it will now show a user-friendly message and form to contact the admin for review if they think it was valid. The email contains links to be able to easily unspam or bring up the last posts. The entire queue is AJAX based so you can moderate blogs with incredible speed, not having to wait for the page to reload on every action. Click an action link (like spam) and it flashes and instantly disappears!

    • Suspected Blogs – this list pulls in any blogs that the plugin thinks may be splogs. It pulls in blogs that have a greater that 0% certainty as previously returned by our API, and those that contain at least 1 keyword in recent posts from the keyword list you define. The list attempts to bring the most suspected blogs to the top, ordered by # of keyword matches, then % splog certainty (as returned by the API), then finally by last updated. The list has a bunch of improvements for moderation, including last user name, last user IP, links to search for or Spam any user and their blogs or blogs tied to an IP (incredibly powerful, be careful with that one!), ability to Ignore (dismiss) valid blogs from the queue, and view a list of recent posts and instant previews of their content or the entire blog without leaving the page (the most time saving feature of all!)
    • Recent Splogs – this is simply a list of all blogs that have been spammed on the site ever, in order of the time they were spammed. The idea here is that if you make a mistake you can come back here to undo. Also if a user complains that a valid blog was spammed, a review link will be sent to your email so you can quickly pull it up here and see previews of the latest posts or entire blog to confirm (normally you wouldn’t be able to see blog content at all for spammed blogs).
    • Ignored Blogs – If a valid blog shows up in the suspect list, simply mark it as ignored to get it out of there. It will then show in the ignored list just in case you need to undo.

Time to clean up your WordPress Multisite network and make some sploggers really mad!


  • Anti-splog tank of doom!
  • Limiting the number of signups per IP
  • Changing the signup page location every 24 hours
  • Random user defined questions
  • ASSIRA - no longer available
  • reCAPTCHA protection
  • Recent splogs queue, notice all the instant actions!
  • Suspected Blogs queue
  • Instant spamming of an entire IP address
  • Instant post previews
  • Instant full blog previews
  • Splog review form
  • Anti-splog process Flowchart
  • Site/Splog creation statistics


To Install:

  1. Download the Anti-Splog plugin file
  2. Unzip the file into a folder on your hard drive
  3. Upload the /anti-splog/ folder to the /wp-content/plugins/ folder on your site
  4. Visit Network Admin -> Plugins and Network Activate it there.
  5. Upload blog-suspended.php into the /wp-content/ folder on your site

To Set Up And Configure Anti-Splog


Can I use this plugin for non-multisite WP installs?

No, this plugin is only compatible (and useful) with Multisite installs.

Do I need to be a paid WPMU DEV member?

A current WPMU DEV membership is needed to get an API key to access our powerful splog-checking service. It is not required however to use the many additional signup protections this plugin provides.

Here are some of the signup protection features you don’t need an API key for:

  • Limiting the number of signups per IP
  • Changing the signup page location
  • Random user defined questions
  • Moderation Queues
Is this BuddyPress compatible?

Anti-Splog is fully BuddyPress compatible with the exception of auto-renaming wp-signup.php. Note that it does not yet protect against spam users or their entries in status updates, forums, activity streams, etc.

How do I get support?

We provide comprehensive and guaranteed support on the WPMU DEV forums and live chat only.


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Contributors & Developers

“Anti-Splog” is open source software. The following people have contributed to this plugin.


Translate “Anti-Splog” into your language.

Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.



  • Update Recaptcha signup links


  • Remove Assira signup protection option that has been discontinued by Microsoft
  • Fix spammed site form not sending reviews
  • Fix missing styles on spammed site form in subdir installs
  • Remove invalid unspam link from review emails


  • New: Change API url to use HTTPS for privacy
  • Fix: Remove Are You a Human as they have closed down the service


  • New: Update to better reCAPTCHA v2
  • New: Move blog suspended file to a place where it can be updated (please manually update the wp-content/blog-suspended.php file!)
  • Fix: Fix depreciated notices from widget
  • Fix: reCAPTCHA issues in Pro Sites custom signup page


  • Fix: API notice could not be dismissed
  • Fix: Update integration for latest Post Indexer versions
  • Fix: HTTPS issues for reCAPTCHA


  • Fix: Are You a Human confict with BuddyPress site tracking


  • Fix: Update blog-suspended.php template to work with ultimate branding logos


  • Fix: reCaptcha API endpoint changed by Google
  • Fix: Update styling of blog-suspended.php template


  • Fix faulty check that prevents super admins from being spammed


  • Fix divide by zero errors when IP blocking


  • Add in local IP blacklist blocking
  • Fix a bug in post checking, tags not added to api call properly


  • Fix some PHP notices
  • Fix blog deletion links on moderation lists


  • Refreshed menu structure and admin screens
  • New Pattern Matching functionality to block bots by signup patterns
  • New Are You A Human PlayThru game captcha
  • New blog and slog creation stats screen with pretty graphs
  • Add tags to API call for more accurate classification
  • Add splogging command capability to admin toolbar
  • Fixed various bugs/notices


  • Fix UN notice


  • Preparations for free release
  • Usability/text updates to admin pages
  • Ability to use your own custom wp-signup template by installing in wp-content/custom-wpsignup.php
  • Another bug fix in splog review form, make sure to overwrite the wp-content/blog-suspended.php file.
  • Depreciated function argument fixes


  • Bug fix in splog review form, make sure to overwrite the wp-content/blog-suspended.php file.

  • Tiny bug fix for WP 3.1


  • WP 3.1 compatibility – This version is NOT backwards compatible!
  • Changed install location for autoupdate capability
  • Fixed bugs with deleting blogs on Anti-Splog pages
  • Added default .po file for translation


  • Fixed email spam link
  • Small bug fixes


  • WP 3.0 Multi-Site compatibility. This version is NOT backwards compatible.


  • Bug fix on dynamic signup page when registration is set to users only


  • Fixed major bug preventing recaptcha, asirra, admin questions from working with BP
  • Added support for spamming/unspamming users of blog when it is spammed/unspammed
  • Highlights in red the spam status of users in Anti-Splog queues


  • Fixed bug conflicting with Supporter free trials


  • Initial Release.