"You can share where you are and the friends you're with in real time from your mobile device."
Facebook members can "check-in" at restaurants, bars, or other social venues and let their friends at the social network instantly know where they are and with whom.
A Places application for iPhone handsets was released, and social network members with smartphones with Web browser software that supports geo-location and HTML5 could use Places at the mobile website touch.facebook.com.
"If you are not in the US you can still see if friends are using it here but you will not be able to check-in," Facebook founder Mark Zuckerberg said at a festive Places launch event at the firm's headquarters in Northern California.
Facebook said it plans to eventually extend the feature to all smartphones and to the social networks more than 500 million members worldwide. (AFP)