Whatsapp has finally rolled out the much needed feature of ‘Delete for everyone’ option. The feature has been launched globally for Android, iOS, and Windows users. The feature lets the user delete the sent messages including media within seven minutes of sending them. The feature will work only if both sender and recipient are using the latest version of WhatsApp app.
This comes as a big relief as people sometimes send messages which contain mistakes, or accidentally sent to someone else. It works for individual as well as group chats.
Both recipient and sender will get a notification when messages get successfully deleted. However, people won’t be notified if deleting message for everyone was unsuccessful. In this case, the receiver might see or read your message.
“Messages you successfully delete for everyone will be replaced with “This message was deleted” in your recipients’ chats (*). Similarly, if you see “This message was deleted” in a chat, it means that the sender deleted their message for everyone,” read WhatsApp blog post.
People are quite happy with this option. 
it would be quite useful