I have been proven wrong far too many times to believe that I am still in any way a decent judge of what may be a good idea or viable startup.

The best example I can give here is from a few years ago when I was chatting online with some startup folks. One of them was building a Twitter based app where you would enter your tweets and it would post them at an interval you specify. I believe my thoughts at the time were that it must be the lamest idea I ever came across. Fast forward a few years and that startup, now known to the world as Buffer, is making over a million dollars a year and growing at a crazy rate.