It would be best to say that you're interested in learning as much as you can within the first month of starting at Facebook. Express your interest in meeting as many people as possible and getting to know everyone on your team. Also, show that you're interested in talking to people on other teams, even if they're not in marketing so that you can get a big-picture view of the organization and feel for how your team fits into their mission. An appropriate answer to this question will vary based on your position and experience level. For a manager-level position, an answer should likely include a plan, where an entry-level interviewee can mention the need to gain experience and learn from colleagues.

"I plan to spend the first month learning as much as possible and getting to know my team. I'll also work on cultivating positive relationships with other co-workers. In past roles, I found it very helpful to introduce myself to key partners in other departments and learn their expectations for someone in my role."