Arbitron Inc is a renowned research firm. They deal in marketing and researching for international media, including Internet and television. They even serve various advertising industries around the world. They mainly focus on local radio market and measuring network throughout the United States. They undertake intensive research regarding media audience based on various criteria, including demographic and lifestyle preferences. They have also gained reputation by developing advanced technologies essential for media and market research - Portable People Meter or PPM. World famous engineering and research organization has their headquarters in Columbia. Their radio rating services roots back to 1965. Nielson Holdings acquired Arbitron for about $1.26 billion, through consent, in 2012.