How do you send mass messages on FB?

Why not just post it on your page and your friends will see it on their feed.

@chyna Tried it. Was ineffective.

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Just start typing each friend’s name into the “To” box and let the autofill complete each one. I think if you want to send to a “group”, then you need to have created the group ahead of time. (Not a “friends list”; that won’t work.)

@CWOTUS Thanks! I think I’m going to create a group of females 18–35 that I keep in touch with regularly who would be interested in the content I write.

You can message up to twenty Facebook friends or email addresses at once. However, if you are contacting someone on Facebook you are not friends with via a Facebook message, you can only message him or her individually. Source

If you decide to create a group, the only way to notify the members is by posting new information on the group site. A group does not have a feature to notify members by private messages. If a member turns off their notification alert, they will not see new posts until they visit the group site.