I also think, on top of what other people mention here, is that social media (whether it’s true or not) has the societal belief of connection attached to it. When you go on Instagram and talk with friends, you’re connecting with those friends or with other people. Books are known for escaping whatever situation you’re in, and typically also take more attention than social media (which again, may be just more of a fake societal belief). That I think would play a role too.