"I think it must be much, much easier to write articles like this about managing Google than it is to actually manage Google."
Based on comments like this getting so many votes, I'm starting to wonder how many Google fanboys use this site. This is true for any critic in any industry. If you have to be the de-facto source of information on something before you can comment on it, then nobody would ever be able to comment on anything. "It's much easier to eat food from a restaurant and pick it apart, then actually go in the kitchen and cook it yourself." True, the critic doesn't risk much.
Motivation is when you give someone an incentive to work hard. As mentioned in the article, if I work on search algorithms, how is a bonus contingent on social networking going to motivate me? I think it's a valid question, and if that's really what's happening at Google, then I would agree, it's a blunder.