Facebook mailman

You're referring to the Facebook feature that allows you to send messages to your friends and family!

Facebook Mailman is not an official feature of Facebook, but rather a colloquialism used to describe the process of sending messages to multiple people on the platform. Here's how it works:

1. Go to the Facebook messaging app or website.
2. Start typing the name of the person you want to send a message to in the "To" field.
3. As you type, Facebook will suggest names of people you're friends with who match the name you're typing.
4. Select the names of the people you want to send the message to by clicking on their names.
5. Write your message in the text field.
6. Click the "Send" button to send the message to all the selected recipients.

Facebook Mailman is a convenient way to send messages to multiple people at once, making it easy to keep in touch with friends, family, or colleagues.