Meta Analyst interview questions

Applied online via Facebook Careers page (I didn't have a referral), then heard from a recruiter within a week after I applied and had a phone screening. Then, I got called to do the on-site interviews, which were 4 back to back interviews. I got the job offer the day after the on-site interview.

I applied through Facebook online and was contacted via email in less than a week to set up a phone screen with a recruiter. The recruiter was very nice and very laid back which made the process a little more relaxed. She told me she loved my resume and actually said how excited she was about it because she felt I was an excellent fit. After a few minutes, (we stayed on the phone still chatting for another 20 min) she indicated she would contact the hiring manager and set up a second phone interview and get back with me. Two days later, I receive an email indicating they have decided to pursue other candidates. I know my qualifications were spot on and my experience was in line with what they were looking for. I'm left feeling pretty confused as the recruiter talked me up quite a bit and left me feeling pretty confident. Not sure what happened. Maybe someone internal was hired? Although it sounded like this role was new for the area. I don't know.