That's exactly what Apple CEO Tim Cook -- maybe the most respected exec in Silicon Valley -- is telling anyone who ever doubted that consumer data mining would result in scandals like the one currently engulfing Facebook.

After what seemed like an eternity, Mark Zuckerberg finally addressed the Cambridge Analytica controversy on Wednesday. Explaining the prolonged silence, Facebook's embattled CEO said he was busy trying to understand "exactly what happened," and how to prevent similar abuses going forward.

From mobile developers to designers to data scientists to product managers to system administrators: these are the folks who make the mobile world go 'round. While not always pretty, Stack Overflow's annual developer study paints the clearest picture imaginable of this influential lot.

Among younger users, Facebook's flagship app has been losing ground for years. We all knew that, yet the rate at which this trend is occurring is startling. Over the past year alone, connecting with brands via Facebook fell from 52% to 40% among younger millennials (17 to 27 years old), and from 48% to 33% among older millennials (28 to 38).