In one sentence, describe what the following article is about:

If you sent a message to someone that makes you feel embarrassed but is not hurtful to anyone, know that the worst is over. A random message sent to the wrong person might be embarrassing, but it won’t kill you. Embarrassment and anxiety manifest in many physical ways. You may feel lightheaded, weak, have a stomach cramp, or a headache. Take deep breaths, do a little stretching, and make sure you stay hydrated. As time passes, these symptoms will fade, along with your embarrassment. If the issue is the result of a group message gone awry, staying a member of the group may only make the situation worse. If a conversation gets heated or inappropriate, it's best to leave it before sending a message you might later regret.  Click the Messages icon at the top right of any Facebook page, (or launch Messenger if you’re using a mobile device.) Open the group conversation you want to leave. Click the wheel icon (desktop) or the arrow icon (Messenger) at the top right corner of the message. Select “Leave Conversation” (on all platform). A notification will be sent to the others that you have left the conversation, and you won't receive any further messages. Having to look at something hurtful over and over again isn’t good for anyone. If you wince in pain every time you see the harmful message in your inbox, you can archive the message. This won’t delete it, but it’ll file it away so it’s no longer in your face. You’ll be able to find it at any time by searching for the recipient’s name.  Open your inbox by clicking the Messages icon at the top right of any Facebook page, or launch Messenger on your mobile device. If you’re using the desktop version of Facebook, click the X next to the conversation you want to archive. In Facebook Messenger for mobile devices, swipe left on the message and select “Archive.” If the person to whom you wrongfully sent a message responds expressing sadness, embarrassment, or anger, respond with a brief message that makes them feel seen, heard, and understood. Some examples:  If the person responding says that they are very angry, say, “I hear that you are angry, and I definitely understand why.” If a person says they are embarrassed, say, “I can understand why you would feel embarrassed. I would also feel embarrassed if someone did to me what I did to you.” If they say they are devastated, say, “I understand and accept that my actions have been upsetting to you. That’s totally valid.” Receiving an angry response from someone you upset won’t feel good, but it’s a part of their process. However, abusive language and threats of violence are never okay, even when you’ve upset someone. Report any hate speech or threats of violence to Facebook.

Summary:
Forgive yourself. Take care of your physical needs. Leave a group conversation or thread. Archive messages you don’t want to see. Validate the recipient’s feelings. Know your limits.