Meta Client Service Associate interview questions

I was referred by a friend and former classmate for this position. Several days later I was contacted by an HR associate for a first-round screening interview. Typical interview questions, with a heavy emphasis on "Why do you want to work at Facebook?" Given that I was employed at the time and not a new hire fresh out of college, I got the sense that there was extra pressure to map the skills I had gained in the workplace on to the job description. I have to stress that I really though I aced this interview. The recruiter told me she'd pass my resume on to a local hiring manager, who would be in touch to schedule a second round. About a week later, I got a note from the recruiter informing me that Facebook had decided not to move forward with my candidacy, and inviting me to apply again later. I suspect the reason I was not hired had to do with my coming off as a flight risk (since I was trying to leave a job less than a year after starting).