OCCUPATION: Internet entrepreneur
NUMBER OF TIME COVERS: 0
PREVIOUS APPEARANCES ON THE TIME 100: 1
PRO: As the founder of Craigslist, Newmark's remains one of the few remaining uber-traffic sites dedicated to public service and impervious to corporate overlords. Where else does a company founder still address customer service issues personally?
CON: As more and more companies enter the online classified market, how much longer can Craigslist sustain its current economic model?
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