Bloomberg reports something very interesting a few days ago:

  Nevertheless, it is remarkable that not a single Google insider has bought a single share of the company in the 18 months since the IPO lock-ups expired, according to data compiled by Bloomberg …

At first glance this seemed more conspicuous than it really is.   Although I think Google is overvalued, insiders like Brin or Page who have tens of millions of shares generally should NOT buy shares regardless of how bullish they are on the company.   This is simple diversification of one’s worth.  For these guys their worth was almost entirely tied up in Google stock and they were right to diversify.  Thus this is simply good fiscal management, not a statement about what they think the prospects are for Google in the long term.