Blippy
Raised $12M from Sequoia to share your credit card purchases publicly — credit card numbers were indexed by Google and no one actually wanted friends to see every purchase
Fatal mistake: Blippy automatically shared your credit card purchases with friends. Raised $12M from Sequoia, Andreessen Horowitz. TechCrunch covered extensively. Privacy nightmare: users never wanted friends to see their complete purchase history. Google search indexed Blippy posts including credit card numbers. Massive privacy breach. Rebranded as Copious (focused on curated buying) in 2011. Shut both products.