Three large tax prep firms sent “extraordinarily sensitive” information on tens of millions of taxpayers to Facebook parent company Meta over the course of at least two years.

• They say some of that data was then used by Meta to create targeted advertising to its own users, other companies, and to train Meta’s algorithms.
• The firms in question are H&R Block, TaxAct and TaxSlayer shared with the social media giant, according to a report by congressional Democrats.

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