http://static.slidesharecdn.com/swf/ssplayer2.swf?doc=discovery-is-the-new-cocaine-v2-1211393766580034-8&stripped_title=discovery-is-the-new-cocaine-going-beyond-engagement Discovery Is The New Cocaine:

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

• We are programmed for scarcity and can’t dial back even when information is abundant
• … (addictive sites) all presented new information that somehow needed to be interpreted …
• this triggers a chemical reaction that makes us feel good …