Transcript:
Meanwhile, in a parallel yet completely opposite universe: you're so different in person, Rebecca. You're so highly moral and have such a perfect life and family on Facebook. Your life is a train rack and you're such a conniving backstabbing jerk.
While are certainly those that turn into trolls when removed from face-to-face situations, I think the joke here is that most people try to portray themselves as having a wonderful life on facebook, while their real life may actually be a mess.