Game of Thrones is an American television series based on George R.R. Martin's novels that has been airing since 2011. It has become a global phenomenon supported by an extensive social media marketing campaign run by HBO, including creating awareness of the show months before episodes air through countdowns and blogs, engaging with fans on platforms like Facebook, Twitter, YouTube and Instagram, and launching interactive games and contests to build excitement around new seasons and episodes. The social media strategy has effectively built a large global fan base and contributed greatly to the success of the show.