MUMBAI: The media planning and buying agency of the WPP group, GroupM, has appointed Karthik Nagarajan as its national director -- social media.

Nagarajan will be part of Interaction Leadership Team and will report GroupM MD South Asia Tushar Vyas. 
 
In his career spanning over 10 years in the industry, Nagarajan has worked for over two-and-a-half years as the director of Nielsen‘s online division in India, which he helped set up.

In his role, he led Nielsen‘s audience measurement, social media and advertiser solution initiatives in the digital space. Nagarajan also managed the launch of the Nielsen Mckinsey JV - NM Incite in India.
 
Nagarajan joined Nielsen from Shipcom Wireless, a technology company based out of Houston, Texas, where he served as Director of Marketing.

Nagarajan has also managed a global research and consulting practice for Frost & Sullivan in the United States, in the areas of biometrics, smart cards and RFID for over four years.
 
Vyas says, "Karthik will be responsible for strengthening the social media practices across all agencies of GroupM. His presence will help us beef up our efforts of understanding the behaviour of digital consumers and meaningful use of such learning in social environment."

Digital arms of GroupM include Mindshare Interaction, Motivator, Maxus Interaction, MEC Interaction, Quasar BMS (Brand and Media Solutions) and Blazar.a