One other thing that Airbnb does that I haven't seen done at other companies nearly as much is a focus on producing videos/stories to tell our story both internally and externally. When I first joined it seemed crazy that we would spend so much time and effort to produce a high quality video (almost a short documentary) to talk about why we were launching a new initiative on our platform. After watching one though, it's clear that video is a much more effective medium to communicate emotion/feeling and that helps employees understand the deeper human element that we're trying to impact and continues to drive employees to champion the mission. Sure, you could have just thrown a bunch of words and stock art on a slide and call it a day but the story doesn't come across as effectively and you don't get the same impact on the feels.
Do note that it is sponsored by InVision, but I didn't think that detracted from the message because there was no product placement. It is also in limited showings, not online anywhere as far as I know.
All released under CC4.0