Deleting old social-media posts is good hygiene, no matter who you are. If you’re applying for college, you don’t want posts from your tween years to keep you from being accepted. If you’re hunting for a new job, you don’t want your online persona to be the reason no one hires you. More than half of employers told CareerBuilder in a 2018 study that they decided not to hire candidates due to content on their social-media profiles.