(n.) One who deals in news; one who is active in hearing and telling news.

a tale-bearing animal adviser announcer annunciator authority busybody channel communicant communicator enlightener expert witness gossip gossip columnist gossiper gossipmonger grapevine informant information center information medium informer interviewee monitor mouthpiece newspaperman notifier press public relations officer publisher quidnunc radio reporter rumormonger scandalmonger source spokesman tabby talebearer taleteller tattler tattletale television teller telltale tipster tittle-tattler tout witness yenta