Members of the U.S. Congress[1] have looked into the privacy implications of apps which have "call home" features. Obviously, nothing was done and this is still an issue. Go figure.

Some apps like the Twitter, Facebook and LinkedIn apps would upload the users' address books, scrape calendar information, access email/SMS, etc.[2] I think that has changed from "industry standard" to "frowned upon".

[1] http://www.forbes.com/sites/connieguglielmo/2012/03/22/congr...

[2] http://www.theverge.com/2012/2/14/2798008/ios-apps-and-the-a...