If you’re like me, you’ve had enough of the Facebook IPO story. For tech entrepreneurs struggling to build stuff, the cacophony of recent press is just more noise. That’s why when my friend Andrew Chen posted an insightful analysis of Facebook user data, I was happy to get back to learning from what the company did right instead of debating what its bankers did wrong.

Chen calculated Facebook’s historical ratio of daily active users (DAU) to monthly active users (MAU) and the stats are startling. Since March 2009, when the earliest data is available, approximately 50% of Facebook users logged in daily.

As other technology companies struggle to maintain DAU to MAU ratios of 5% or less, Facebook’s numbers appear stratospherically high in comparison. But what is equally surprising is the consistency of that ratio over time. Despite periodic user revolts in reaction to changes in the site, the ratio remained strangely stable. In fact, the number has risen over the past year and is now hovering at 58% as of March of this year.