A tweet from a Croydon police account has sent the internet into a frenzy.

"Advice" started circulating around facebook telling people that if they were approached by a robber at an atm machine, to enter their pin numbers in backwards.

This would message said that this would then trigger a camera to start recording while also alerting the police.

“When you do this the money will come out but will stay in the slot," the message said.

"The machine will immediately alert the police without robbers knowledge and begin taking photos of the suspect.”

Croydon MPS were quick to point out that the message was entirely made up.

"Did you know that if you're being attacked at an ATM, enter your PIN backwards and it'll call the police and a camera will start recording," Crodyon MPS' tweet said.

"Neither did we, and that's because you can't. It's an internet hoax and the system doesn't exist.

"Please share to stop the misinformation."

That message has since been retweeted more than 300 times.

Turns out you can't trust everything you read on the internet.