Relevant Stories on Slower Connections:
In the past, if you were on a poor internet connection or had no connection, you might need to wait for stories to load when you opened News Feed. We are now testing an update in which we look at all the previously downloaded stories present on your phone that you have not yet viewed, and rank them based on their relevance. We also factor in whether the images for the story are available. This way we can immediately display relevant stories you haven't seen yet, instead of showing a spinner while you wait for new stories. When we receive new stories from the server when you're back online, we load and rank those stories normally.
Commenting When Offline:
You can now also comment on stories you see when you don't have an internet connection. While the ability to like and share posts when you're offline has been available for some time, now you can comment on posts and the comment will be posted whenever you next have a connection.
Facebook's updates are meant to help users who are on a poor Internet connection or those who typically have good connection but are temporarily in an area with bad reception like the subway. The company says it will be testing and rolling these improvements over time.
You can download Facebook from the App Store for free.