The lure of social media is more than most kids can handle. And that lure results in extending the amount of time it takes to do homework. Every time your student stops studying to check on a post, he has to retrace work he has already done when he gets started again. Encourage him instead to put the phone away while he studies and see how quickly he finishes his assignments. Then he can enjoy his social media time uninterrupted as well. Getting to bed earlier would be a nice bonus too.