Facebook CEO and founder Mark Zuckerberg has another headache to contend with, after it was reported that federal prosecutors have begun a criminal investigation into the firm’s data-sharing agreements.

In December it emerged that leading tech firms and consumer brands such as Amazon, Apple, Spotify, Microsoft and Netflix had struck deals with Facebook to harvest the personal data of millions of its users, including private messages.

The controversial data sharing deals had been revealed after an investigation by the New York Times (NYT), but Facebook insisted at the time that it had done nothing wrong.

But now another article in the New York Times has alleged that a grand jury in New York has subpoenaed records from at least “two prominent makers of smartphones and other devices.”

The report, cited two people familiar with the requests, said that both these companies had entered into partnerships with Facebook, “gaining broad access to the personal information of hundreds of millions of its users.”

It seems that Facebook’s data-sharing deals are being investigated by prosecutors with the United States attorney’s office for the Eastern District of New York.

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