I know a young lady who started college living in a dorm.  Every time her family visited her, they told me, they found her with her nose buried in her phone, on social media.  She flunked out at the end of her freshman year.  This study, http://psychcentral.com/news/2013/04/12/social-media-use-may-harm-grades-of-college-freshman/53711.html  says there is a link between heavy social media use and declining GPA's.  That may or may not be so, since correlation isn't causality, but if you're in college and your GPA isn't so good, I suggest you read the article.