This comes from Facebook help desk:
If you've been blocked from sending messages on Facebook, it may be because you sent a lot of messages recently or people reported your messages as unwelcome. Make sure to use your
real name and picture to help the people you're messaging recognize you.
Please also keep in mind that this block is temporary. You can still use other Facebook features to connect with your confirmed friends while you're in this block.
Once your block is over, please only send messages and friend requests to people you know personally. To learn more about our policies, please review the
Facebook Community Standards.
Note: If you're blocked from sending messages, you may also be temporarily
blocked from sending friend requests.
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