Many "Most Active" and "Most Recent" tags are created by the system.The is designed behavior. Administering tags 1. Log in as admin. 2. Navigate to "System Definition -> Tage". 3. Search Name starts with "Most". A great number of "Most Active" and "Most Recent" tags are coming up. There are two kinds of "Most Active" and "Most Recent" tags in the system. - With the value of the owner empty. There are "Most Active" and "Most Recent" by default which are created by the system. -With the value of the owner system user. The "Most Active" and "Most Recent" tags are created for the owner of every user by the system when the user creates a tag for the first time. The owner becomes empty if the relevant user is deleted from the system.