Yammer, the social networking and internal comms startup, has selected Ogilvy PR as its AOR for media relations. According to PRWeek, Yammer worked with the Horn Group until an unidentified conflict arose. Ogilvy won the business following an RFP.

Responsys, a provider of on-demand marketing services across the Web, mobile, and other digital platforms, has selected Hill & Knowlton as its AOR. The firm’s San Francisco office will aid with media relations, digital outreach, events, and messaging.

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