The player rankings (and other screens) have usernames displayed, and next to them, an ONLINE tag that is either there or not.
This means that it is easy to know when to attack another player: wait until the ONLINE tag disappears.
The problem is, it is trivial to make it display all the time (for some players, it is).
What do you think, would it be better to not display the ONLINE tag at all anymore?
i think you'll find most of us that are online all the time actually are online all the time, or maybe its just me ?