Can You Be Trusted?
If you ever start sentences with, "Have you heard about..." you're probably spreading information out of turn. In other words, gossiping. Even if the information you're sharing is 100% accurate, there's probably a proper channel for it to travel, and you're not it.
Sharing rumors out of turn is a domino affect. First, it means your superiors can't trust you to hold sensitive information. Second, if your peers or employees hear you share it, they're more likely to continue gossiping.
Whether or not you know something is accurate, if it's not your responsibility to communicate that data, keep it to yourself. The motivation for gossip is usually to seem like "you're in the know" or have some authority, when in reality it reveals poor judgment and immaturity.