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People signing up for new Messenger From Facebook accounts can no longer do so without an account on the parent social network.

Facebook quietly implemented the change late last year. The social network initially introduced the ability to use Messenger without a Facebook account in June 2015, in Canada, Peru, the U.S. and Venezuela.

Users were able to start Messenger accounts by supplying their name, phone number and a photo.

Facebook cited limited use of the capability, with a spokesperson saying, “If you’re new to Messenger, you’ll notice that you need a Facebook account to chat with friends and close connections. We found that the vast majority of people who use Messenger already login through Facebook, and we want to simplify the process. If you already use Messenger without a Facebook account, no need to do anything.”

CEO Mark Zuckerberg revealed plans last January to unify the infrastructure powering messaging via Facebook, Messenger, Instagram and WhatsApp.

David Cohen is editor of Adweek's Social Pro Daily.