Well, this is something we had all suspected, but app developers seem to have a very lax awareness of security and privacy.
According to reports by CIO Magazine[1] and PCWorld[2], privacy flaws have been found in Android apps including Instagram and Viber. The findings were reported by the University of New Haven Cyber Forensics Research and Education Group (UNHcFREG). According to the group, the situation is rather dismal, with problems such as images being stored on servers without access controls.
Another apparent problem with these apps is that even when someone tries to report a security issue, they cannot get in touch with the developers. But then, this too has been known for a long time. @nov, for example, struggled with many major apps.
UNHcFREG has posted 5 videos about this matter on YouTube. I think they will be informative.
[1] http://itpro.nikkeibp.co.jp/atcl/idg/14/481709/091000017/?ST=cio-appli&P=2
[2] http://www.pcworld.com/article/2603900/popular-android-apps-fail-basic-security-tests-putting-privacy-at-risk.html
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