Recursos: “The State of the U.S. Mobile Advertising Industry and What Lies Ahead”;comScore, Ipsos OTX MediaCT, ScanLife Mobile Barcode Trend Report, December 2010; Nielsen Mobile Media Audience Measurement US Quarterly Overview Q4 2010, Media Mobile Marketing Watch 16 May 2011, CTIA wireless semi-annual survey 12/31/2008, DigiDay q3 Apps State of the Industry Survey Nielsen Mobile Internet & CTIA Custom Research 2009; M:Metrics 2010 Future of Mobile Advertising by Advertising Research Foundation, 56th ARF Annual Convention; Nielsen Research, November 2009; Insight Express Mobile Ad Effectiveness Study, February 2010; ROI Research Inc. and Microsoft “Future of Mobile”, November 2009; Smart Phone Intelligence Survey, Compete, January 2010; CTIA Quick Facts, September 2010