noun: A reference book or electronic directory made up of individuals’ photographs and names.
noun: A college publication distributed at the start of the academic year by university administrations with the intention of helping students get to know each other better.
noun: (trademark) A social-networking website where users can find acquaintances or "friends", exchange messages, and post updates.
noun: A personal web profile on the social-networking site Facebook.
verb: (intransitive) To use the social-networking site Facebook.
verb: (transitive) To send a message or leave a comment on Facebook.
verb: Alternative form of Facebook [(intransitive) To use the social-networking site Facebook.]