New York (CNN Business) Facebook said Monday that it would allow a network of millennial-focused pages tied to the Russian state-backed media outlet RT back on its platform after having previously suspended them following inquiries by CNN.

Facebook suspended the pages , run by a company called Maffick Media, on Friday, February 15th, as CNN was preparing a report on Maffick's ties to RT, which is funded by the Russian government. RT's subsidiary Ruptly is Maffick's majority stakeholder.

Facebook does not have a formal policy in place requiring state-backed outlets to disclose their funding, and its handling of the Maffick pages appears to be an ad-hoc approach that only came about after CNN asked about the pages.

Senator Mark Warner, the leading Democrat on the Senate Intelligence Committee — which has been investigating disinformation operations on Facebook — said in a statement provided to CNN on Monday, "At this point, Facebook should have established a clear policy when it comes to state-supported media."

"While I'm pleased Facebook made the RT-linked groups disclose the affiliation to RT in their 'About' section, this kind of disclosure should be clear and conspicuous," he added.

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