Facebook is soon going to put an option to unsend a message on Messenger. You’ll get only 10 minutes to unsend a message, which gives WhatsApp a lead. Users can delete a message on WhatsApp for up to an hour after they’ve sent it. This comes from The Verge after they spotted the feature listed as “coming soon” in the release notes for version 191.0 of Messenger for iOS.
Instagram also gives its users an ability to unsend their messages. However, it doesn’t inform the recipient whether the sender has deleted the message or not unlike WhatsApp. So this is still the question, whether Facebook will implement the feature like WhatsApp or Instagram.