The web-based multiplayer highscores are not available yet, since we're still into developing additional GameModes.
We're going to distinguish them by Season and by GameMode as well, since a Deathmatch can't be really compared to a TimeAttack-Run versus your friends.
So you'll have quite a lot of spots and ways to reach highscores and rankings within the multiplayer - once it's here.
For now: please check the ingame stats or rump back later. :)