That's the wrong way to calculate the "flop". 1 in 15k registered accounts quitting is a flop, but it can easily be argued that not all 500 million heard about

That's the wrong way to calculate the "flop". 1 in 15k registered accounts quitting is a flop, but it can easily be argued that not all 500 million heard about the day. It's a marketing/awareness issue and language barriers (in how many languages did the day get promoted?). The more correcet number is how many have pledged to quit and actually did? That's the real number. Even then it's not fool-proof because those pledging are already self-selecting. However, if zero (or very close to zero) people from pledgers actually quit, we even can call it a win for Facebook.