If you haven't been on Twitter much yesterday or today, you may have been unaware of the "Girls" marathon -- or rather, #Girlsathon -- that HBO aired today. At 3pm Eastern, the cable network reran all 10 episodes of the show's first season. The series, which Lena Dunham, previously of "Tiny Furniture" fame, wrote, directed, produced with Jenni Konner and Judd Apatow, and starred in with Allison Williams, Jemima Kirke and Zosia Mamet, follows four women living in New York City in their early 20s as they navigate their love lives, friendships and fledgling careers, making a lot of #mistakesgirlsmake along the way.