The title of the blog dates back to my first computer - a BBC model B micro which came with a whopping 32k of memory. Programming on the BBC was carried out in a series of different modes. MODE 5 produced large blocky pixels and became an expression used by me and my brothers to explain away moments of idiocy, e.g. "I must have been in MODE 5 when I pipetted ice cold water onto that hot light bulb."
If you would like to know more about GamerGate you would do well to visit the DeepFreeze website. This provides a very user-friendly breakdown of the events of the past couple of years and has links to archived sources, including a lot of material that has been deleted from the internet by individuals attempting to cover their tracks.