File storage app 4shared caught serving invisible ads and making purchases without consent Zack Whittaker @zackwhittaker / 2 hours ago With more than 100 million installs, file sharing service 4shared is one of the most popular apps in the Android app store. But security researchers say the app is secretly displaying invisible ads and subscribes users to paid services, racking up charges without the user’s knowledge — or their permission — collectively costing millions of dollars.

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