Meta Data Science interview questions

There was an open-ended analytics question: What is a Facebook product that you'd be interested in working on, and how would you use analytics? And another more specific question: We've introduced this particular new feature (it was something about friend recommendations). How should we determine whether to keep it or not? The coding question could be done in Python, SQL, or R. It was a straightforward problem that involved calculating the friend acceptance rate over time. The table consisted of events (friend request or acceptance), date, and user id's.

They asked SQL questions, probability and product analysis