If I install an SEO plugin or a tags plugin, will it propogate to every user on my WPMU site? Or do I have to activate it for each user?
If I install an SEO plugin or a tags plugin, will it propogate to every user on my WPMU site? Or do I have to activate it for each user?
If you want it for all users or want a feature that interacts with all blogs on the system then put it in mu-plugins. The plugin php file shouldn't be in a directory.
Not all plugins work like this. Many aren't made for MU and the mu-plugins folder. Regular wordpress plugins often require you to edit them before they work on MU.
Check out a mu-plugin called Plugin Commander.