 Digital media growth was estimated at 4.5 trillion online ads served annually with digital media spend at 48% growth in 2010.An increasing portion of advertising stems from businesses employing Online Behavioural Advertising (OBA) to tailor advertising for internet users, but OBA raises concern of consumer privacy and data protection.Nonlinear marketing, a type of interactive marketing, is a long-term marketing approach which builds on businesses collecting information about an Internet user's online activities, and trying to be visible in multiple areas.