Among the recent grop of gif-based glitch Tumblrs is Year of the Glitch, a glitch-a-day blog run by the artist Phillip Stearns featuring a totalizing glitch, where any trace of the previous media has been virtually destroyed. Meanwhile, Tumblrs Glitch Gifs, Glitch-Hop, Glitchee, and Compression Errors feature glitches gleaned from popular, recognizable sources, where amusement comes from the intrusion of a chance-like error on a recognizable piece of media. There's even Food Mosh, a glitch take on the popularity of pictures of food. These are more easily classified as utilizing datamoshing, where manipulations in digital compression produce pixel bleeding.
Some theory about the practice is can be provided by Thomas Levin: "What is at stake in the vocabulary of such 'compression errors'—evident both in the domains of avant-garde video and in the more popular idiom of music video—is a rendering readable of 'differencing,' of what I call the 'preductive aesthetics of the absent image.'"
Studies: Dither + Flicker No. 1 from Year of the Glitch
Via Food Mosh