Maintains a canonical list of terms by syncing terms created for each blog with the global terms table.

Checks an email address against a list of banned domains.

Determines if there is any upload space left in the current blog’s quota.

Determines whether a user is marked as a spammer, based on user login.

Adds a new user to a blog by visiting /newbloguser/{key}/.

Corrects 404 redirects when NOBLOGREDIRECT is defined.

Notifies the network admin that a new site has been activated.

Notifies the network admin that a new user has been activated.

Ensures that the current site’s domain is listed in the allowed redirect host list.

Removes a user from a blog.