You know those people you follow on Instagram — the ones who post stuff that’s unfit for public consumption? On this week’s Saturday Night Live , Kevin Hart plays Darnell Pepper, the host of Why’d You Post That? , a show dedicated to Instagram photos so bad, gross or tasteless that no filter can help them. Hart hosted Saturday Night Live , which featured musical guest Sia. The sketch show has lampooned social media users in the past, including an unaired sketch about the mundane stuff we’re all guilty of tweeting .