Facebook is useless, Airbnb will be gone in five years when more horror stories surface, as well as dropbox, today storage is so cheap anybody can have 20GB for free when buying a cheapo hosting plan. Even GAE gives you 10GB free, all you need is a piece of software.
So, etsy will last forever, facebook won't, amazon will, dropbox won't, godaddy will, airbnb won't.
Sometimes I think, investing a billion dollars in instagram is running a freight train loaded with money over a cliff.
That money would have been better invested in a new eBay (without auctions) that would last forever, empowering small merchants and providing a complete experience for ecommerce, from payment to delivery.
We already had enough with social, but the hype machine won't die just yet, so fuck investors, I hope they lose all their money and then blame the economy.