Even if you haven't met molly she's amazing! And when you do it will most likely be the best day in your adolescent life. She's super funny, and super nice! Every Molly loves a good youtube video, so post one on her wall. Don't be shy around Molly, no worries just take your friends phone away and say something random. For instance "I heard you weren't awkward".
It doesn't matter if you haven't met Molly, you'll love her anyways!