An updated Facebook app for the popular Apple mobile devices shows when friends are online and then gives the option of ringing them up by tapping an icon on the screen.
Calls are routed over the internet using telecom service data plans or connections to Wi-Fi hotspots. Facebook introduced a version of the feature earlier this year in its messenger programme.
Upgrades in the Facebook 5.5 app included a button designed to make it easier to Like online content and post comments at the social network.
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