8chan (also known as InfiniteChan and ∞chan) is an anonymous image board created in October 2013. Unlike its competition, the website allows users to create and moderate their own custom boards. The site gained a large influx of new users following the controversial banning of all GamerGate related threads on 4chan in September 2014.[taken from KnowYourMeme]
Relevance to GamerGate Edit
After the Quinnspiracy, and consequently GamerGate discussions have been silenced on 4chan and Reddit, those interested in the topic were forced to seek new sites that weren't being censored. Image macros have been posted on 4chan prompting users to migrate to the new site, and eventually it gained a steady user base.