You can now take notes or save content online by sending each other messages using WhatsApp
But if WhatsApp is your preferred messaging app, this cannot be done unless the user opens a group chat and includes himself as one of the group members, and then sends a message to this group. Who wants to go through all that just to remember that the dog walker is on vacation or to save a story or video they just saw online? The Meta-owned app fixed this by spreading an update that allows WhatsApp subscribers to send messages to themselves.

Now you can send a message to yourself on WhatsApp

You can undo the accidental deletion of a message that you deleted from your WhatsApp account
WhatsApp has added more than just the ability to send messages to yourself. After the update, you can undo the “Delete for me” function to recover a message that you accidentally deleted from your WhatsApp account. To see how this works, send yourself a test message (which you can do now) and long press on the test message. Tap on the trash can icon at the top of the screen and you will see a popup window. Select Delete for me and a bar will appear at the bottom of the screen that says “Deleted message for me” with the word UNDO on the right side of the bar. Touch to undo the deletion and the message will return.
How to block others from knowing when you are online
Now you can also control who can see when you’re online. From the WhatsApp app, tap on the three-dot menu icon at the top right of the screen and go to Settings > Privacy > last seen and online. You can touch No one in the top quarter of the screen so that no one can see when you were last on WhatsApp. Below you can choose who can see when you are online. The options are All and Same as last seen. Select the last option and if you have chosen Nobody as last seen, nobody will be able to see if you are online.

Block others from seeing if you’re online
When you are about to send a message to one of your WhatsApp contacts, the last time they were seen in the app will be displayed below that person’s name. So if you are a private person, you may want to follow the instructions in the previous paragraph so that no one knows when you were last on WhatsApp and if you are now. On the other hand, you may want to let your contacts know when you are available to have a conversation on the platform.