Can Agents Share Awareness/Address of an Upcoming Property?

[Mike Miller]

Say you interviewed two real estate agents that you we're considering to list your home with. You met them at THEIR OFFICE, they did not come over to your house. The agent does know your address though.

You have not signed or decided with either agent yet. One of the agents you interviewed then told outside parties about it, perhaps their friend or fellow agents in the office.

A couple days later, several neighbors are now aware of your intentions to sell, asking you about it, and other agents start approaching you saying they heard you are selling soon. 

Is that legal for agents to disclose their awareness of it with others like that? Or just not moral/ethical?