The process took 3 weeks. I interviewed at Groupon (Chicago, IL) in Apr 2011
Interview
there was one phone interview, and then a final round interview. everyone i met was very pleasant, and i would highly recommend the internship program. in terms of interview questions, they were mostly behavioral, with 1 brain-teaser during the final round. the final round consists of two 1-1 interviews, for about 30 minutes each.