We've seen huge investments over the past five years into start-ups, apps, services, etc., that VCs hoped would turn into the next Uber/Facebook/Snapchat/Twitter/whatever. Now we're seeing VCs and the economy separating the wheat from the chaff. Furthermore, we're finding that even the Snapchats and Twitters may not be as great of companies they were hoped to be. Rational thinking is simply replacing irrational exuberance, and I don't think the blame (credit?) can be placed on any one company.