If I invested in, say, Twitter and you asked me right after they exploded "how do you feel about this investment?", I'd tell you plainly: I doubt they'll ever b

If I invested in, say, Twitter and you asked me right after they exploded "how do you feel about this investment?", I'd tell you plainly: I doubt they'll ever be profitable, but I'll make my money back in future rounds. And that's what happened, except that they eventually, maybe became profitable (if you look at the numbers the right way). Pinterest may end up being a brilliant investment that makes everyone a ton of money, but I find it highly doubtful, and right now they're hoisting the "Mission Accomplished" banner before they've even gotten into the hard part. Sorry, but the metric for success in business isn't getting people to use your product, it's turning that utility into money. They haven't shown they can do that.