Grapevine communication is helpful or harmful?

Grapevine communication is helpful for some persons, like who get their own profit about their business, but its bad effects are more as compared to positive result, for normal living people......who get exited for some good time to see, but due to rumors, they can't,.....biggest grapevine spreads the media channels, ..for media channels, its just a timepass, and a way to business, but for normal people its feelings, which is hurts a normal people......
Thank you.