Is it possible to follow registered users?


Is it possible to:

1) Make sure all registered users currently on the forum have their names/usernames showing? (i.e., not allow them to make the option of hiding their presence.)

2) Be able to follow a registered user when they're on the board, to see which forums they go to or where they're making posts, etc?

3) See IP addresses or any other possible identifiers of non-registered guests?

Would any of these need customizations or add-ons?

Thank you