On 02/27/16, mark lewis pondered and said...   
       
    ml> that you trust that are on a key raises the trust in that key... it is   
    ml> like you meeting me on the street and we don't know each other at all   
    ml> but if you have five friends vouch for me, your level of trust in me   
    ml> increases... if i have five friends who vouch for you, my level of trust   
    ml> in you increases... this trusting also increases for our friends as they   
    ml> now have another positive link to us and each other...   
      
   This sounds like the narrative that Mark Z wrote for Facebook :)   
      
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