i had been concerned about people knowing i had done a facebook search for them..people i knew many years before: but if they do find out--they can approach me if they want to.
one embarrassing thing happened a few months back:
a birthday notification appeared on my fbook--a cousin i hadnt seen since his childood--we occasionally chatted on fbook. I wished him a happy birthday. His older brother ( my age ) replied that he had died the previous year. I never knew.