Met recruiters at a campus career fair. The recruiter I spoke with was fairly nice, young, and stressed the casual culture of the company. I spoke to her briefly about the position I was interested in and after she looked over my resume and asked about my SAT scores, she invited me to an interview the next day, held on our campus. I was emailed a link to a personality/crtiical thinking test the same day and took it before the interview.
One strange thing: I was told at the fair that I wouldn't neet to dress formally (jeans would do) for the interview, but when we met again the next day for the interview she was dressed pretty professionally. Just thought that was strange. I think you should err on the side of professional, or at least business casual even if they tell you jeans will do.