Mark Zuckerberg will be headed to Washington. No one knows precisely when or to whom, but he himself has said he would be “happy” to testify.

That he has never been before Congress is one of those minor miracles that only technology companies seem capable of generating through their bulky “policy” (i.e. lobbying) teams and still considerable popularity.

But times are changing and in the wake of the Cambridge Analytica affair, Facebook processes that have been known for years are coming under the most intense scrutiny they’ve ever received. Senator Ron Wyden, for example, has already submitted a formidable list of questions to Facebook.

I’m most interested in pinning down the facts around Cambridge Analytica and political advertising generally. But Facebook is multifaceted, so I reached out to a dozen close observers of the company to see what they wanted to ask Facebook’s CEO.

On Cambridge Analytica