NEW YORK: Burson-Marsteller has confirmed it is no longer working with Facebook to promote the company's position against Google's social media venture Social Circle.

The separation follows a day where both companies fell under intense media scrutiny after it was revealed the agency was not disclosing it was hired by the popular social networking site to plant negative stories about Google's service.

Burson-Marsteller representatives including former CNBC tech correspondent Jim Goldman and former political journalist John Mercurio pitched bloggers and opinion formers the idea of ...