The one month free trial does not mean much. Linkedin flagged me as a recruiter, and refused to let me search for people at one of my previous companies. They insisted I had to be a premium member to search the way I was searching. I signed up for the free month of premium, and I was still flagged as a recruiter, and my searches denied. Linkedin support had difficulty explaining there were two levels of premium, but they finally confirmed I had to pay to be able to search. I paid. Then my searches sort of worked. Out of five specific people, only one was actually in Linkedin. I realize they need money to make their business work. I just did not like the way they extracted the money from me. My free advice: don't search like a recruiter. Whatever that means.