While this is anecdotal, some ibanking friends told me that alot of the traditional wall street banks 'boycotted' google for going w/ a smaller player who did a non-traditional format (auctions) that threatened their business model and that resulted in lower demand (and lower price) for their shares at IPO than would have otherwise been the case.
Google priced their shares based on an auction, I'd say it was priced right. It was also much smaller because it wasn't a bunch of insiders trying to dump their shares at an inflated value.
Google sold 19.6M shares, 14.1M of them were from corporate. There were 271M shares in total, so only a very small amount of the company was transferred. In contrast for FB, there are 2.14B total shares and the IPO was for 421.2M of them, a much larger percentage of the company. In addition, insiders made up 241M of those shares sold, which is actually the majority of the IPO.