Not only did “A Thin Line Between Chuck and Nate” contain our favorite line of the entire season (“You pregnant little hypocrite!”), it was the first to play up the role of Gossip Girl herself and her effect on the character’s lives. Now we understand why they act so crazy! The whispers of the Constance Billard students talking about the latest posts — Slut. I see a bump. WTF does she think she is? Keep your legs closed, Blair — are as scary (if not scarier) than the whispering of the island on Lost, and that place has actual monsters.
— NYMag’s recap of Gossip Girl s01e13 the mid-season finale.