Regarding AirBNB -- you may be right, but I'm not so certain. It appears to me that the amount of impact it has depends a great deal on where you are. In my area, AirBNB isn't a significant factor at all -- but in a city a couple hundred miles away from here, it's had a significant impact. Facebook's impact is obvious to pretty much everyone, everywhere. AirBNB? Not so much. Which is not to say it's had no impact...

> I think this bar to world changing is way too high, little changes can make big impacts over long periods. Especially on cultural values.

I agree entirely with this.