I applied through an employee referral. The process took 3 weeks. I interviewed at Zynga (San Francisco, CA) in Jan 2016
Interview
Phone screening with recruiter, then hiring manager, then onsite with peers. Everyone was very friendly, and knowledgeable. The process was long in my case because they really tried a position that was the best fit for my profile. I then talked to a few different teams and hiring managers until I found the right position.