Want To Know How (Not) To Pitch Your Startup? Look No Further.
techcrunch.com
techcrunch.com
And sometimes a business simply can't be summarised to such a short length, after all you want the listener to gain a quick, yet good understanding of what your start-up does. Keeping it short could lead to leaving out critical information though.
That said, I'll certainly work on single sentence descriptions for my projects, it can only be a credit to your business if you can have the listener instantly know what you do in a matter of seconds.