This is like the infamous dropbox comment [1], only instead of you making it as a prediction, you made it over a decade after the company became wildly successful.
You think without Facebook the choice would be $10/min long distance calls and that email wouldn't be an option? I can agree the big use case of Facebook probably accelerated internet access but I don't think it would be that severe.
[1] https://news.ycombinator.com/item?id=9224