1. A system for classifying finger touch events, the system comprising: a touch screen configured to display an interactive element; one or more vibro acoustic sensors coupled to the touch screen; a touch event detector configured to monitor the one or more vibro acoustic sensors and to save vibro-acoustic signals sensed by the one or more vibro acoustic sensors, wherein the touch event detector is further configured to detect touch events in which the interactive element is touched by a first or a second finger part of a user, and wherein the touch events result in generating the vibro-acoustic signals; and a vibro-acoustic classifier configured to classify the vibro-acoustic signals.