Startup Idea : An app to say that you are thinking of a person

You are thinking of that woman or that guy , but is embarrassed to talk to him or her. Maybe the person also think of you and you did not pay attention to it . A good start would you send something ... how to make the smartphone vibrate person or other signal. Nothing too flashy because it is something only person to notice that you thought it. Understood? After they learned that you are thinking about it , it might take some action after learning that.