If you cannot reply back to someone on Facebook, check to see if you have them blocked. You may also need to change your settings to include them in who can see your posts.
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If someone is sending you messages on Facebook and you cannot reply, the reason is because the person has that certain settings on their account so that only people on their friends' list can message them.
Facebook has determined that you were sending messages at a rate that is likely to be abusive. Note that these blocks can last anywhere from a few hours to a few days. Unfortunately, they cannot lift the block for you. When you are allowed to resume sending messages, keep in mind that it's possible to run into a block based on how many messages you send and how fast you send them. It's also possible to be blocked when either starting a new message thread or replying to a message. Lastly, deleting old messages will not allow you to send more messages. In the future, please proceed with caution to avoid hitting the limit again. Please be aware that further abuse of such features can result in your account being permanently disabled
To answer/reply to a Facebook message all you need to do is go onto the message you want to reply to. Under what you have been sent there is a blank bar so type in your message then on the right click reply.
If the person sending the email to you also sent the same email to 10 other people then using the reply to all would send a reply to the person that sent you the email and the other 10 people.
yeah but they'll will be freakn mad and probably be rude