Before Facebook, Greenspan was a Creative Director at Omnicom Group's BBDO NY.???Jeff is the perfect leader to work closely with a small group of leading brands to push advertising creative into the social age,??? said Jonah Peretti, BuzzFeed???s founder and chief executive officer.Also read: BuzzFeed to Open Washington, D.C. Bureau, Hires Two ReportersBased in New York, BuzzFeed is a website that