Portals - WSJ.com

   "What is it about a Web site that might make it literally
    irresistible"

   "who is interested in the evolutionary and biological basis of the
    human need for information"

   "new and richly interpretable information triggers a chemical
    reaction that makes us feel good, which in turn causes us to seek
    out even more of it"

   "When you find new information, you get an opioid hit, and we are
    junkies for those. You might call us 'infovores.'&nbsp"

   "We are programmed for scarcity"

  This is the reason why twitter is so addictive despite so much
  noise

  2 key things here - new and richly interpretable
 
 - Portals - WSJ.com
   http://r3.sharedcopy.com/3drsv