Davos needs a lift this year: gloomy economic forecasts and gloomier-still snow forecasts have meant the WEF has lost some of its optimistic pep. But there is nothing like a cocktail-party cameo by Mick Jagger to bring that swagger back. Not that the NewsBeast dinner hosted by Tina Brown and Credit Suisse with co-hosts Pamela Thomas-Graham, Sheryl Sandberg, Abigail Disney, and Ellen Kullman in honor of 2011 Nobel laureate Leymah Gbowee, needed too much extra oomph. The guest list already included Chelsea Clinton and her husband, Marc Mezvinsky; Niall Ferguson; Dr. Oz; Iceland's first lady, Dorrit Moussaieff; and Arianna Huffington. Not that Leymah herself was overwhelmed, “When Tina introduced me I had to tell her, ‘You called me over to meet Mick Jagger, I have to tell you, Tina, I had no idea who he was ...'”