Met representatives at Career Fair who told me about an Information Session. I applied for an interview online through my college's recruiting site. I was selected for an on-campus interview (though unsure how many people were not selected). The interviews for Nielsen come with an analytical assessment portion (90 min test) that you can take at any point in the day which was the most surprising part of the process.

I applied through campus e-recruiting. I simply uploaded my resume and was contacted within a week and a half that I'd been selected for an interview. The interview consisted of a lot of "Tell me about a time when..." type questions. It's highly suggested that you think about your experiences thoroughly and how you triumphed before the interview. All communication was through email, which is a bit impersonal, but understandable due to the high number of applicants.