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Plugins extend and expand the functionality of WordPress.
There are two types of plugins;
- Regular plugins
- mu-plugins.
These are located in separate folders on your site and work differently.
Regular plugins are located in the “plugins” folder; they can be activated and deactivated on a per-blog level inside your blog dashboard via the Plugins page.

Mu-plugins, on the other hand, are the plugins located in the “mu-plugins” folder; these are activated by default affecting all blogs on the installation.
While there are over 4,000 regular plugins most of these don’t work on WordPress MU sites.
PLEASE NOTE:
- Any regular plugins you want to try should be thoroughly tested by uploading to your site, and enabling it just for a test account.
- Activate the plugin on the test blog taking notes of any errors which occur. Immediately remove any plugins with bugs and only use them site-wide once you have fixed all their issues
Those regular plugins known to work WPMU/BuddyPress include:
1. AddThis Social Bookmarking plugin
2. Akismet
3. Audio and video comments
4. Greet Box
5. Subscribe To Comments
6. Threaded comments

See Next:
Installing regular plugins on WPMU