There is a bright side to Facebook‘s slide: It was a hard-earned lesson for the company’s typically tight-lipped and evasive co-founder and CEO, Mark Zuckerberg. And going forward he is going to open up, even just a little.

His chat today at TechCrunch’s Disrupt event was notable in its topics. Interviewer Michael Arrington did not hold punches, but rather pushed the Zuck on touchy subjects including the stock price and the company’s limping mobile strategy. And brilliantly, Zuckerberg was unusually candid.

Read more: The Bright Side To Facebook’s Slide: Mark Zuckerberg Gets Candid – Forbes.