We humans can have all sorts of addictions. Some researchers believe that addictions may be positive -- such as to jogging or meditation -- but of course many addictions are negative.
What about Facebook? There is no doubt that Facebook is addicting -- according to Nielsen, users spend as much time on Facebook as they do Google, Yahoo, YouTube, Wikipedia and eBay combined. But is this a positive addiction or a negative one? Is Facebook jogging, or is it heroin?