Following the release of real-time Insights for page owners, it appears Facebook has now rolled out live commenting. 'Live', as in comments now update in real-time, without the need to refresh the page.and, it seems like this only happens on your Feed or Profile pages. Facebook has not yet issued any official announcement.
Real-time comments are also available on Friendfeed, a service which Facebook acquired in 2009 and from which it was known to 'borrow' features even before that.
A demo video of the new feature at work is available under:
[tags]social media,social networking,real time,comments,live comments[/tags]