Google is racing with Yahoo and Microsoft to take a stake in Facebook, and win some of its advertising business. As with YouTube, Google was late to get in on the Facebook deal — but again, it's making a full-court press, with some of its top people. Negotiating the deal: Tim Armstrong, Google's chief of ad sales; Susan Wojcicki, Google's VP in charge of product management for advertising; Joan Braddi, a Google VP involved with search; and Megan Smith, a veteran Google dealmaker. Armstong is leading Google's approach, but we hear Smith is playing a crucial behind-the-scenes role. She was also, coincidentally, spotted by many chatting up Facebook CEO Mark Zuckerberg at a recent party thrown by Facebook app-developer iLike.