One of the more well known VCs in SV gave a talk two weeks ago and told a story about when he met the founders of SnapChat two years ago. He asked them "So, tell me honestly, are people using this app for anything but sexting?" One of the founder replied "No, there are loads of cats too!" The VC asked "Wait, how do you know there are cats too? Isn't everything deleted?" Needless to say he passed on the investment.