Google is fundamentally different from Facebook because they solved a really hard problem really well and then found an excellent way of monetizing their solution. People still use Google today largely because it works better than the other options out there. Further, the other options are worse not because the others aren't trying hard enough or spending enough on search.

To me, Google falls squarely in the disruptive and hard category. I mean no disrespect to Zuckerburg, but there's a reason Google was founded by two Stanford PhD students and not a bunch of bored undergrads.