I applied through an employee referral. The process took 4 weeks. I interviewed at LinkedIn (Mountain View, CA) in Mar 2013
Interview
Contacted by a hr recruiter and followed by two phone interviews.
Interview questions [1]
Question 1
Contacted by a hr recruiter - background screening to find out the matching position
1st phone interview - discussed a little bit past project and a coding question (inverse polish notation calculator).
2nd phone interview - discussed some details about past and current projects and a code question (print out nodes of a tree level by level).
Interviewers wanted bug-free code.