I applied through university. The process took 4 weeks. I interviewed at WPP (Kansas City, MO) in Apr 2016
Interview
group interview, each of them ask related questions. The atmosphere was pretty easy. First introduce myself and then they asked some questions based on my resume. It was not a difficult one, the people there were pretty nice and did not ask hard questions.
Interview questions [1]
Question 1
some basic questions, i.e. one of your biggest achievement
Face to face interview. The HR was very nice and introduced me a lot about the company culture. Got an offer next day by e-mail. Good experience, and look forward to the internship there.
I applied through a recruiter. The process took 2 weeks. I interviewed at WPP (New York, NY) in Mar 2017
Interview
Started with one short phone interview that then progressed into going to the HQ in New York and meeting with 5 separate people to see if you might fit in well underneath them.
Call interview in the beginning. Promised to call back by the end of the week. No response at all. It's been a month. The recruiter asked many questions and explained specific description of the job.