Amazing video at http://vimeo.com/701759 by Nauman Ali Khan on wasting time.
There has to be a purpose to everything you do. If you engage in activities that have no benefit in this life or the next, you are guilty of al-laghu.
Wasting time just hanging-out, spending hours of social media etc, can really take a lot of your time away. You’ll never get this time back as every breath goes forth as a decree of destiny. This should never be wasted.
Watch the video. It definitely is worth it.