Today Google ads are everywhere - even in mobile apps and email. And they work with any signal they can get. Facebook Ads on the other hand are now using retargeting ads based on your searches outside of Facebook. Not that any of the two types of ads are inherently more evil than the other in my point of view.
Winklevosses were just a couple of deuchebags with an idea. Go to any Techcrunch/tech party in NYC, and you will meet plenty of them. They go nowhere, because they don't have the hard skills to make something a reality.
Ideas, are cheap. Given some beer, and one hour of time, anybody can come up with a dozen of decent ones. Execution on the other hand is hard. It takes sweat and real work to make something happen.
It's not a matter of the Winklevosses being "douchebags", or even "just coming up with an idea", which is false anyway as they had already developed the code and wanted Zuckerberg to finish it. They trusted Zuckerberg to deliver a product. Instead he held them back, while making his own version of their work. He screwed them over plain and simple.
Also, perhaps, pagerank is viewed as an innovation founded on real technical insight, as opposed to Facebook, which basically recreated MySpace (etc.), initially resegementing the market by serving privileged Ivy kids rather than lower status music fans. That's not the sort of story that people valorize here.
He was an asshole in their business relationship and should have stopped working with them the minute he was inspired to create Facebook. But he didn't steal anything that belonged to them. They would not have succeeded with their original idea even if they found a developer to do all the work for them.
I would also say that in contrast to Facebook Google has used their mountains of cash to try to make meaningful contributions to research (the whole life extension gambit for example).
It also probably has to do how media props Zuckerberg as always trying to change the world vs Brin/Page who seem to lead more quiet personal lives.
Cults always have their most staunch defenders even in the face of shady goings on.
(In a literal sense, by giving out free cool technology, for example.)