Two Twitter users, @chFtheCat and @LARCENY_, have claimed responsibility for attacking the digital gaming service Steam, which was down for over an hour on Friday. Battle.net, the login system used by World of Warcraft and other games produced by Blizzard, was hit by a similar attack. A parallel set of attacks, launched by an entity that calls itself @DerpTrolling, involved the DDoSing of scores of gaming servers in the days leading up to Fridays separate attack on Steam, et al.”]