Facebook needs to answer these questions about the Russian campaign to influence American voters

We now know that a Russian organization spent two years trying to influence American voters using Facebook. Here are the questions Facebook has yet to answer and why it matters:
What were the demographics of the users who saw the ads, and how were they targeted?
What were the 470 accounts connected to the ad campaign?
What was in the ads, and what types of ads were they?
Was there any overlap between the content used by the Russian campaign and other known campaigns?