Facebook has announced a new app for iPhone and iPad users called Poke, that lets people send quick messages, photos or video to each other in the same way you would send a text, but with the ability for that message to expire after a set time.

"Today we’re announcing Poke, an iPhone app that makes it fun and easy to say hello to friends wherever you are. The poke feature has been a part of Facebook since 2004. Now we’re excited to share a new poke experience for mobile," says Facebook on the new app.

"With the Poke app, you can poke or send a message, photo, or video to Facebook friends to share what you're up to in a lightweight way. You can poke an individual friend or several at once. Each message expires after a specific time you've set, either 1, 3, 5 or 10 seconds. When time runs out, the message disappears from the app."

The new messaging app is a direct competitor to Snapchat, which has shot up in popularity among teenagers who want to send private messages that pop up and, once read, disappear.

And yes, if you're thinking that Poke sounds familiar, it's what we all used to do on Facebook in the early days when we wanted to show someone we where thinking of them. Oh, how times have changed.