In their globe-spanning surveillance for terrorism suspects and other targets, the US National Security Agency and its British counterpart GCHQ have been trying to exploit mobile phone technology, a report in The New York Times said.
When a smartphone owner opens Angry Birds, the popular game, and starts slinging birds at chortling green pigs, spies could be lurking in the background to snatch intimate details like a user's "political alignment" and sexual orientation, the report said.
Since then, the agencies have traded recipes for grabbing location and planning data when a target uses Google Maps, and for vacuuming up address books, buddy lists, telephone logs and the geographic data embedded in photographs when someone sends a post to the mobile versions of Facebook, Flickr, LinkedIn, Twitter and other Internet services, it said.
The trawling done by the spy agencies scoops up location, age, sex and other personal information of the users.
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An NSA analyst's enthusiasm was evident in the breathless title - "Golden Nugget!" - given to a slide for a top-secret talk in 2010 that described iPhones and Android phones as rich resources, the report said.
The scale and the specifics of the data haul are not clear, it said.
President Barack Obama announced new restrictions this month to better protect the privacy of ordinary Americans and foreigners from government surveillance, including limits on how the NSA can view the metadata of Americans' phone calls.
However, he did not address the information that the intelligence agencies get from leaky apps and other smartphone functions.