> Google tends to release code and promote it without
> really using it much internally first.
Is this actually true? My understanding (from watching many AngularJS presentations) is that Angular was developed with input from many teams at Google.
"with input" != actually using it. There are very few public-facing Google apps/sites that use Angular, whereas a large chunk of the Facebook frontend uses React and their other libraries like Relay. That said, I have no idea if/how Google uses Angular internally, so it might get more use than we see from the outside.
(edit: Angular was first used on an internal app at Googel: https://www.youtube.com/watch?v=r1A1VR0ibIQ&feature=youtu.be...)