Facebook has never been more addictive. In 2013, it was 63% of Facebook users who checked in daily. In 2014, that number shot up to 70%. If you check Facebook day after day, you join over 864 million others with the same compulsive routine. For many of us, Facebook is a kind of addiction, a default habit that is now rewiring our brains. Ofir Turel, a psychologist at Cal State Fullerton, has the research to prove it.