Facebook has been long rumoured to expand its improved search feature, also known as Graph Search, to mobile platforms. And now Facebook has finally started testing out Graph Search on mobile devices, with select users.

Mashable reporter Seth Fiegerman, first spotted the change and posted the screenshot of the new interface – which heavily resembled to web version of Graph Search.

"We're really early in the game on [Graph Search]. You can see that because we haven't even really rolled out our mobile version of Graph Search yet and we're a mobile company. Pretty soon, you should expect us to roll out the mobile version of this. I think that's going to be an important step because most of the usage of Facebook overall is on mobile,” he said.

Rolling out Graph Search to mobile devices will help Facebook more precisely analyse the things its users are interested, and help determine what's hot on the social network. From users' perspective, finding things on the social network will get much easier and help engage in more activities on the network.