Facebook sent a cease-and-desist letter to the developer of an app that lets you track your friends' locations.
The developer of Who's in Town said he built the app to highlight privacy issues with Instagram's services.
The legal threat comes after Business Insider revealed that the startup Hyp3r was harvesting millions of Instagram users' data and tracking their locations.
Instagram is now cracking down and has also warned its marketing partners against data scraping.
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