The Highlight smartphone app, which alerts users when their friends are in proximity, must be accessed through a Facebook account, even though in theory it could work independently of Facebook.

WSJ: Corrections & Amplifications

However, because it was working in tandem with the existing liver, and was only left working for a couple of hours, the research did not show whether it could recover all its functions, and work independently to keep the animal alive.

BBC: Frozen liver transplant success