The EU's executive body today gave Facebook until January 31 to answer a "statement of objections" about merger information the social media giant gave the Commission two years ago.
The Commission, the EU's merger and anti-trust watchdog, is concerned that Facebook can match its users' accounts with WhatsApp user accounts. The company said in 2014 that it could not do this. But Facebook's August terms of service and privacy update suggest it can, according to the Commission.
"The Commission's preliminary view is that Facebook gave us incorrect or misleading information during the investigation into its acquisition of WhatsApp. Facebook now has the opportunity to respond," EU Competition Commissioner Margrethe Vestager said in a statement.
In a statement, Facebook said it respects the Commissioner's process and is "confident that a full review of the facts will confirm Facebook has acted in good faith."
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"We've consistently provided accurate information about our technical capabilities and plans, including in submissions about the WhatsApp acquisition and in voluntary briefings before WhatsApp's privacy policy update this year," Facebook said.
"We're pleased that the Commission stands by its clearance decision, and we will continue to cooperate and share information officials need to resolve their questions."
"Companies are obliged to give the Commission accurate information during merger investigations. They must take this obligation seriously," Vestager warned.
Such EU probes do not imply guilt, but they give companies the chance to examine relevant documents, reply in writing, or request an oral hearing.
Facebook bought WhatsApp for USD 19 billion in 2014.