(Bloomberg) -- The digital display-advertising sector -- led in the U.S. by Facebook Inc., Google and Twitter Inc. -- faces a potential antitrust crackdown as French regulators start an inquiry with a view to publishing final findings in the second half of next year.

Months after Germany’s antitrust agency began investigating Facebook’s control over the private data of millions of users, the French Competition Authority will zoom in on the importance of data and algorithms in the online display-advertising sector, according to a statement released Monday.

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