The recent update from Google to their search algorithm seems to have hit a few sites rather severely. I can't say for sure that this change is responsible, but the traffic graph from Skeptics looks rather convincing:
Traffic dropped by 40% around the time Panda 4.0 rolled out.
Gaming SE (Arqade) also got hit by the update:
Web Apps got hit really hard, traffic is almost halved:
The reason I post this here is to figure out why certain sites were punished by the change, and if possible find a way to avoid the penalties Google seems to be applying.
Some sites like Server Fault profited substantially from the change, so this is not an SE-wide adjustment.
Does anyone have some data on why these sites specifically might be downrated and how this could be avoided?