I believe that the employer pays employees their salaries to keep working for seven or eight hours daily, and he didn't agree, while signing the contract, that there is few hours set aside daily for chat with friends, talk in mobile, checking Facebook, etc.
And I feel that doing these activities is not ethical and makes employees lose focus while working.
How do I convince my employees to stop doing that themselves?
And note: Of course employees should take a break or multiple breaks while working and do whatever they want in this break, but I am talking about the habit of keeping chat and Facebook open all the work time.
UPDATE For all who got me wrong and thought that I want slaves to work eight hours without looking right or left: Sure I am not this, man, and we are not in the career which needs that approach.
I am talking about keeping chatting and using Facebook all the time. For example, if the worker is doing his work and keep Facebook and two or three chat clients open and are getting notifications all day long.