title: Tooltips in the era of touch
body: <p>Tooltips are an incredibly useful interface paradigm to know an application. They are the mapping between the visual control and the application specific action associated to that control. The user can explore the action without invoking it just by hovering the mouse pointer.</p>
  
  <p>The touch devices make this paradigm basically impossible. This limits the usability of the app, which becomes in some cases pretty mysterious. </p>
  
  <p>Do you know if a substitute for the tooltip concept exists for touch devices? They effectively lack one degree of freedom in ui interaction: the pointer position. How to regain this communication channel effectively?</p>