1. Why Facebook didn't publicly disclose the misuse of data by Cambridge Analytics when it learned about it in 2015. Nor why it didn't subsequently reveal it in the midst of several controversies related to the election of Donald Trump, including "fake news," whose campaign was known to have contracted with Cambridge Analytics.
2. Why Facebook's PR machine last Friday night opted to front-run exposés by both The Guardian and NY Times.
3. Whether he'll answer calls to testify on the matter in front of Congress, and his thoughts on the possibility of greater social media regulation.
4. An apology.
Thought bubble: If you're reading Zuckerberg's note and wondering why Facebook hadn't yet taken these seemingly basic steps, it's because the company is now begrudgingly curbing its core business function: collecting and providing access to data. It's not something it naturally wants to do.