Welcome to Sierra Oscar Lima
You recieved an invite to this group for a few reasons:
1. You added Born Acid as a friend on Steam because he is a friendly, helpful player and made your game more enjoyable.
2. The opposite of above you are a fun or helpful player.
3. For any kind of Steam or TF2 trading requests and such.
Mainly did this because I want great L4D2 and Portal players to join and play in events.
Join if you want.