Plot: The privileged prep school teens on Manhattan’s Upper East Side first learn that notorious party girl Serena Van Der Woodsen is back in town the way they learn all the important news in their lives–from the blog of the all-knowing albeit ultra-secretive Gossip Girl. Serena’s closest friend, Blair, is just as surprised as everyone else to find that Serena has suddenly ended her self-imposed exile to boarding school and returned to Manhattan