Good for some general perspective on (lack of) user privacy in the app industry:

http://techscience.org/a/2015103001/
"Who Knows What About Me? A Survey of Behind the Scenes Personal Data
Sharing to Third Parties by Mobile Apps"

summarized by Ars Technica here:
http://arstechnica.com/security/2015/11/user-data-plundering-by-android-and-ios-apps-is-as-rampant-as-you-suspected/

"Apps in both Google Play and the Apple App Store frequently send
users' highly personal information to third parties, often with little
or no notice, according to recently published research that studied
110 apps. ... 49 percent of Android apps sent users' names, 33 percent
transmitted users' current GPS coordinates, 25 percent sent addresses,
and 24 percent sent a phone's IMEI or other details. An app from
Drugs.com, meanwhile, sent the medical search terms "herpes" and
"interferon" to five domains, including doubleclick.net,
googlesyndication.com, intellitxt.com, quantserve.com, and
scorecardresearch.com ..."

The Wikipedia apps were not among those tested - sadly, because it
might have been a nice opportunity to highlight the fact that we don't
share data with third parties at all. (In another context, we made
that point with this tweet:
https://twitter.com/Wikipedia/status/579220963755044864 )

--
Tilman Bayer
Senior Analyst
Wikimedia Foundation
IRC (Freenode): HaeB

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