Function: Filter the bp_user_can value to determine what the user can do in the members component.

Function: Do not allow the new user to change the email address if they are accepting a community invitation.

Function: Provide a more-specific welcome message if the new user is accepting a network invitation.

Function: Provide a more-specific “registration is disabled” message if registration is available by invitation only.

Function: Sanitize the invitation property output.

Function: Filter the user profile URL to point to BuddyPress profile edit.

Function: Load additional sign-up sanitization filters on bp_loaded.

Function: Make sure the username is not the blog slug in case of root profile & subdirectory blog.