Handelsblatt 10/05/2012 http://www.handelsblatt.com/economy-business-und-finance-ipo-roundup-facebook-raeumt-mobiles-problem-in-seinem-geschaeft-ein/6616140.html
WSJ 17/04/2012 http://blogs.wsj.com/tech-europe/tag/carsten-frien/ http://blogs.wsj.com/tech-europe/tag/madvertise/
GigaOm 16/04/2012 http://gigaom.com/2012/04/17/mobile-ad-firm-madvertise-buys-turkeys-mobilike/carsten-frien/
