Have you seen someone's smiling recently? well, any kind of smile of course. Have you know that smile doesn't guarantee anything? I mean, its not always that a smile means someone's happy or someone's satisfied with things. Smile is a smile, a cover for each face. Anyone can smile, ofcourse no one can tell the difference where is a heart smile or a 'smile' smile. People happy, they smile. People Sad, they smile also to make them self though, letting people know that life must and will go on.
And like I said, A smile is a smile, only our self know what is a smile for.