Sonic_Hedgehog is the official Twitter account for SEGA's Sonic the Hedgehog video game series. In June 2015, the account began interacting with fans, incorporating a large subtextual knowledge of memes, lore, Internet culture, which caused it to become much more popular.
The official English Sonic the Hedgehog Twitter, @sonic_hedgehog, was launched on January 27th, 2009. Prior to June 1st, 2015, the Sonic social media channels were run by former SEGA employee Kellie Parker; on her last day of employment, Aaron Webber, also known as RubyEclipse in his role as an admin on the SEGA Forums, was announced as her successor.  In addition, Webber is SEGA's Associate Brand Manager.
Beginning on June 9, after the announcement of the new game Sonic Boom: Fire & Ice, Webber changed the account's tweet habits by beginning to respond to tweets made by users much more frequently. The first response was to a tweet made by video game journalist Jim Sterling, referencing an earlier account in which SEGA sent him a large Sonic poster in response for a negative review of the game Sonic Colors. The tweet received 287 retweets and 560 favorites as of June 15th, 2015.
On the same day, @sonic_hedgehog responded to a question from another Twitter user by tweeting the infamous Gotta Go Fast illustration. This tweet received more than 2,600 retweets and favorites as of June 15th, 2015.
On June 10th, the Twitter account responded to another fan's question about Sonichu, mocking Chris-chan's blue arms incident from late 2014. On June 11th, @Sonic_Hedgehog responded to a previous tweet with a picture of a Sanic Hegehog game cover. (shown below).
— Sonic the Hedgehog (@sonic_hedgehog) June 11, 2015
That same day, the newly-popular Twitter was covered in an article on the technology news site The Verge.