Facebook introduced its “Safety Check” feature last October.
In a press release, Facebook said its engineers in Japan began working on the project after the 2011 earthquake and tsunami in the country.
The team wanted to give its users a fast and easy way to let as many people as possible know they were safe after a major disaster.
"The team set out to create a simple and easy-to-use tool that allows people to connect with their network of friends and family when it matters most," Facebook said.
