Jan 03, 2019 · First, long press on the message you have sent by mistake. The message can be deleted within 10 minutes of posting. Past that time span, you can delete only your version of the message and not the recipient’s copy. Similarly, Instagram uses the same feature although there seems to be no window where the user can unsend a message. Anyhow, talking about Facebook, the feature works for 10 minutes post pressing the send button and works on text, photos, videos, group chats, etc which is kinda cool. Apr 29, 2019 · Although Facebook limits your messages to 150 people, you can create multiple group messages containing the same note until you've reached all of your friends. If you're using Facebook on your computer, you'll also have the option to create a Facebook Group, which allows you to reach more people by posting instead of chatting.