Notifies a user that their account activation has been successful.

Fires immediately after a user is added to a site.

Fires immediately after an existing user is added to a site.

Fires after site signup information has been written to the database.

Fires after a user’s signup information has been written to the database.

Filters the redirect URL for 404s on the main site.

Filters whether a user should be added to a site.

Filters whether a site name is taken.

Filters whether to update network site or user counts when a new site is created.

Filters the upload quota for the current site.