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Jonathan Kopp, partner, global director of Ketchum Digital
Oversees all aspects of digital and social media for the agency's global clients

Promoted tweets can be a great tool for PR pros who have a nuanced understanding of the channel, its users, and their expectations from the brands that seek to engage them. In the wrong hands, however, all bets are off.

At least for now, Twitter is approaching the paid model in a smart, measured, user-centric way. The first ...