"We are testing some extreme prices to determine what functions filter spam," Facebook said in reaction with an AFP inquiry with regards to the costly delivery fees.
In December, Facebook began testing the feasibility of charging to assure that messages from strangers pass into inboxes of intended recipients.
At its launch, the Facebook Messages test, limited by the United States, let a sender pay some money to make sure a digital missive is routed to someone's "inbox" even though the individual is just not in their circle of friends.