Mark Ritson: Facebook should hang its head in shame for measurement errors

A lot of people ask: “Mark, how long have you been married?” That’s a tricky question for me because I work at Facebook (disclaimer: not really). So rather than come out with a single comparable metric like – oh I don’t know – years of marriage, I prefer to approach the answer differently.
Usually I trot out about a dozen different data points one after the other. These include average number of waking minutes spent with my spouse per day and the total number