I applied online. The process took 1+ week. I interviewed at Viacom (Santa Monica, CA) in March 2012.
After reviewing my cover letter and resume, I got an email saying that they wanted to schedule an interview and to list my availability. They never responded back about what time, instead they called me out of the blue. After I passed through their surprise screening interview I scheduled a time to talk with them on the phone for a 2nd round interview.
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