When interviewing you as social media manager, employers want to assess your technical skills with social media communication and monitoring technologies and your "soft skills" in terms creating compelling social campaigns and being the voice of the brand. Expect lots of questions about how you use technologies and lots of hypotheticals about how you would handle different difficult situations. Employers will also ask about successful campaigns that you ran, and how you demonstrated success.
Why did I choose to be a _____ major? Why would I want to work in this environment? (This company is only women)