Study finds app users worried about privacy

Taken together, the study found that 57 percent of app users have either uninstalled or avoided apps due to privacy issues.

Mobile apps can raise more privacy concerns than applications on desktop computers because they have access to more personal information, such as the user's physical location.

The Pew study found that 19 percent of app users have turned off location tracking features to protect their privacy. 

Apple changed its privacy policy for apps earlier this year after researchers revealed that the Path social networking app was accessing users' address books without their permission.

According to Pew, 88 percent of U.S. adults own a cellphone, and 43 percent say they download apps.