I went through the same interview for senior at Facebook and failed. Thankfully I got a Google offer a couple of hours after I got my Facebook rejection.
What pushed me over the bar for Google was probably making fewer mistakes on the technical loops but also having more people vouch for me on the inside (they like refs that work at Google).
Yep that's similar to how I got my current job. Strong referral from someone else inside the company, we had worked together for about 4 years. I had one phone screen which was a combination "culture fit" and general talking about my experience programming. One technical interview which was way less abstract than the FB ones. And a final meet-the-team interview which was more of a hangout.
The pay isn't Facebook-tier but is still pretty darn good, and I'm enjoying it a lot, which I'm not sure I would have at Facebook. It was probably the better path for me overall.
What pushed me over the bar for Google was probably making fewer mistakes on the technical loops but also having more people vouch for me on the inside (they like refs that work at Google).