Leet Noobs documents , for over 10 months, a group of players in the online game World of Warcraft engaged in a 40-person joint activity known as raiding. Initially, the group was informal, a «family» that wanted to «hang out and have fun.» Before joining, each player had been recognized as expert in the game; within the group they had to adapt their expertise for the new joint task and align themselves to new group goals. Through their shared activity,...