I am waiting to buy Herman Miller chairs for pennies on the dollar. Remember those days?
(I'm guessing here that Craigslist and Facebook will survive.)
Craigslist over the past 2 years has had zero issues, I've interacted with fairly even keel 40+ year old people that are easy to work with. The "no lowballers, I know what I got" crowd has mostly departed Craigslist.