Ads in mobile apps opens users to risk

http://cyart.blogspot.com/2008/08/art-on-technology-just-got-closer.html

A study of over 100,000 applications in Google Play (formerly Android market) has found that more than half contained ad libraries with nearly 300 of which able to grab code from remote servers that could potentially give malware writers and hackers a away into your smart phone or tablet.

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Story added 20. March 2012, content source with full text you can find at link above.