us a window into just how much of your personal data is at risk this is victoria been on a few dates? yep. reporter: an american who recently moved to london. here, unlike in the u.s., european law requires dating apps to turn over data they keep on users if requested. we had three people living in europe request their data we found that hinge collected a stunning 250 pages of data on victoria in less than six months nbc news looked at these four dating apps and found they collected personal information, including everything from exact location data to sexual preference. some collecting users chat messages, and grindr collecting hiv status it s made me rethink using the app. reporter: the assistant attorney general for national security how long does that data live for? it could live forever. reporter: justice department officials tell nbc news they are concerned about grindr, the popular dating app for gay men.
these four dating apps and found they collected personal information, including everything from exact location data to sexual preference. some collecting users chat messages, and grindr collecting hiv status it s made me rethink using the app. reporter: the assistant attorney general for national security how long does that data live for? it could live forever. reporter: justice department officials tell nbc news they are men. it s owned by a kunlun tech, a chinese gaming company, sparking concern the data coulde gornmet do you have insight into how the chinese government can obtain data from say a chinese-owned app? what we know is that chinese law requires a chinese company to share any information that it has with the chinese government if it s asked.