Derptrolling (sometimes referred to as Derp) is the name of a hacker group that was active from 2011 to 2014. They largely used Twitter to coordinate distributed denial of service attacks on various high traffic websites. In December 2013 they managed to bring down large gaming sites such as League of Legends in an attempt to troll popular livestreamer PhantomL0rd. Public reaction to their presence has been generally negative, largely owing to the unclear nature of their motives.