Grapevine communication is helpful or harmful?

This type of Communication can be used by a company for a good purpose from business point of view, for example a company rumors the news that it is giving the oppertunity to employees that they can get early retirement and they will get a lump Sum amount, and if they do not get early retirment, company will throw them out without any lump sum amount. On hearing this, some people get the retirment and they get the amount, This helped company in getting fresh and telented staff, with out any operession to the old employees.In this way, it is helpful gfor company and may be for employees. But it is not like that it is always helpful for all.It may be harmful for some group while helping some other group at the same time.