ReadWriteWeb recently ran an excellent story on Why Google is Terrified of Facebook. For people trying to understand why Google places so much emphasis on Plus and social networks, look no further. Forget current differences in revenue, market capitalization, and other measures for a moment. Emphasis on current.
As I write in the book, Google’s top brass is smart enough to understand The Innovator’s Dilemma. In the Age of the Platform, nothing is guaranteed. Leads can shrink in a very short period of times.