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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