I applied through college or university. I interviewed at Nielsen (New York, NY) in Nov 2015
Interview
Very rigorous interview process that includes several rounds assessing your writing, and verbal communication skills along with, your analytical skills. They have a strong relationship with several schools including Northwestern and NYU so you may be at a slight disadvantage if not from there.
Although the process was very rigorous, I would say that it was an enjoyable one and the reflection required for it, helped me for other interviews.
Interview questions [1]
Question 1
On the last interview, I was asked: What's one piece of advice you have for Nielsen?