Facebook has started monetizing from its features.
Facebook Other folders is a known option. The Facebook messages are filtered and goes to other folder if spam or not relevant.
Now to send messages to profiles' inbox you need to pay $0.35 USD. Facebook says that the payment is to confirm that the message isn't spam.
Messages sent free of cost will reach the 'Other' folder. This folder will contain all the messages and emails that have been filtered out of your inbox – similar to gmail 'SPAM'
Messages sent to Facebook pages doesn't have this option. This might be a limited feature available only in for US profiles.
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