From the Forbes article:

“They also determined his password on the campfire team collaboration tool instance used by Gawker (a real time chat utility) and with it extracted 4 gigabytes of Gawker chat logs. From within those chat logs the attackers were able to extract FTP (file transfer protocol) servers, usernames, and credentials for the sites thq.com, valvesoftware, rockstargames, lucasarts, scea, kotaku, and 2kgames.”

Does this indicate a breach for users of those sites as well?