Gossip has become so much a part of our lives that most people do not even realize that they are doing it. Why you or I may consider gossip, they feel is idle chat.
The H.R. Department at my place of business tried the seminar approach and it had no effect, other than infuriating the gossippers, who felt their freedom of speech was being infringed on.
My advice is to tell employees to keep their private lives to themselves and not give the gossippers anything to talk about.