If you have been playing Left 4 Dead 2 for a bit, you probably have your own lists of who is naughty and who is nice. We already make it easy for you to track who is being nice – we have the Steam Friends list. But we know people can rage, players can grief, and some people… well some people you just don’t want to play another game with.

For those special people, we have the blocked list. Think of it as your own personal naughty list. Not only will those people not be getting gifts from you this holiday season, they also won’t be joining you in any games, reindeer or otherwise.

Once you add someone to your blocked list, they will not be able to join your game. This means they are blocked through the lobby interface, the server browser, the recently played list, and even direct connecting. They are gone from your life.

This does also mean if a friend invites them to your game, they will be blocked. It also prevents you from joining a game where there is a player you have blocked. If it was a mistake or you kissed and made up, you can always unblock them and everything will return to normal.

How do you block someone? You can simply block any user from within the Steam Community page, Steam chats, or your Steam Friends list. Players can also be blocked while in a game via the Steam Overlay, which provides an easy path to both locate and block current and recent players from joining your future matches.

Don’t worry about offending someone with your block. As always, your blocks are private. Only you can see the list of people you’ve blocked. And again, don’t worry about making a mistake blocking, you can always unblock someone at any time.

What games will support your block? Left 4 Dead 2 is the first. We want to test it here. CS:GO will be next and then we will continue to add games that use Steamworks matchmaking.