Good point, RB. I would add that Buffett went to a local restaurant in Omaha and determined that folks were still using their AMEX card.
Fast Forward today an investor would be able to track FB downloads on the Apple app store and Google play, in addition to any anecdotal evidence about family or friends deleting their FB.
https://www.buzzfeed.com/alexkantrowitz/nothing-is-going-to-happen-to-facebook-or-mark-zuckerberg
"And though users posted #DeleteFacebook en masse, Facebook actually rose to 8th place from 12th in the iOS mobile App Store since the day before the Cambridge Analytica news broke. It’s holding steady on Android, too.
After examining whether first-time US installs of Facebook were dropping, Randy Nelson, head of mobile insights at app analytics company SensorTower, told BuzzFeed News: “The short answer is no.” App Store rankings don't directly reflect user numbers, but they're a good of indicator of interest."
Also:
https://www.appannie.com/en/apps/ios/top/united-states/overall/iphone/
https://www.appannie.com/en/apps/google-play/top/united-states/overall/
Good catch, Liberty.