Washington - Facebook paid users, including teens, to track their smartphone activity as part of an effort to glean more data that could help the social network's competition efforts, according to a new report that may raise fresh privacy concerns.
An investigation by the online news site TechCrunch said the effort, which had been known as the Onavo Project and later rebaptized as Facebook Research, was used to gather data on usage habits.
The news could be a further embarrassment for Facebook, which has been under heightened scrutiny over failing to crack down on manipulation of its platform and for sharing private data with its business partners.
According to TechCrunch, Facebook said it shut down the application on Apple's iOS on Wednesday after the article was published, but apparently kept it active for Android users.
The program paid users ages 13 to 35 up to $20 a month for "root" access to their devices to track their location, app usage, spending habits and other activity.
According to a statement to TechCrunch, Facebook claimed there was nothing secret about the effort and that it obtained parental consent for teens where required.
Facebook did not immediately respond to further requests for comment.
The project may have allowed Facebook to scoop up more data about younger users as it fends off a challenge from rival services like Snapchat, which has become more popular than Facebook among US teens.