There are a few reasons why Andrew Garfield is not on social media. For one, he values his privacy and does not want to share every aspect of his life with the world. Additionally, Garfield has said that he finds social media to be self-absorbing and prefers to focus on living in the moment instead of documenting it online. Finally, as an actor, Garfield understands that part of his job is to maintain a certain level of mystery and mystique - something that would be difficult to do if he was constantly posting pictures and updates on social media. All things considered, it makes sense that Garfield has chosen to stay off of social media platforms like Instagram and Twitter.