Google has been the exact opposite. Google folk don't change the interface: it's a search box (it took 10 years for me to be able to put a picture on that page). They add features in beta and test them for years before they roll them out to everyone. Search results may be updated on a regular basis with slight tweaks to the algorithm, but in such subtle ways to truly offer refined value to the consumer without causing mass hysteria. When Google does do something big, it tells you about it and offers you the chance to prepare and ease into it. When Facebook makes a change, it's summarily adopted overnight and that's that. You have no say in the matter.
What's truly most disturbing, and what cannot be forgiven (most of the issues above are basically changes in design and can be forgiven) is that Facebook messes with privacy and Google rarely does. Facebook's means of generating revenue is by guessing who I am and what I like based on what I post. It's implied targeting. Google's means of generating revenue comes from stated requests for information. That's search targeting. Google does have a behavioral, privacy-threatening component in some of its mail ads, but for the most part they're still based on keywords and not by scraping personal data. It's still fundamentally targeting by content rather than audience. Google's hat is hung squarely on the hook of search, whereas Facebook's hat is hanging by a thread to the hook of privacy and inter-personal communications.
Another contradiction between Google and Facebook is that Google came out almost as an altruistic effort to organize the world's information (and, of course, "do no evil"). The company gave away search functionality to sites and search to users, fostering an image of usefulness and respect by their peers. From day one, with Zuckerberg's attitude and approach, Facebook came off as antagonistic, selfish, and only in it for the money. When it released Facebook Connect to the world, attempting to expand the social graph and make it easier for the world to share information, it did so by stating this would give them more access to more information. It came off positive at first, but companies understand there was never an altruistic idea behind that move.
Maybe it's simply my perception, but for the first five years of Google's life, it did everything right, coming off as altruistic, mutually beneficial, and simple. From inception, Facebook has come off as greedy, immature, and only in it for themselves. Google's pledge was to the consumer, whereas Facebook's pledge was for its shareholders. I understand that this is a business, but if you look at how Google did it and where it is now, it's hard to argue success. In the tangible world, it's the difference between Apple and Microsoft. Google and Apple feel like brothers of another mother, whereas Facebook and Microsoft feel like a match made inheaven.
So if you ask me where things will be in five to-10 years, I have to predict that Facebook will lose some of its luster and position in the marketplace. It's not to say that someone else will come along and replace it as the giant of the social web. It's more to say that something will come along and change the way we view the social Web, and Facebook might get left in the dust.
Or maybe I'm wrong. What do you think?