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Facebook's News Feed will adapt to your connection speed
Facebook is really trying to show News Feed stories you might want to see, even if you're on a slow internet connection. Last year, it tweaked its algorithms to serve up stories by caching them on your device if internet speeds slow down. While this guarantees you have some kind of content, it means you might get old or irrelevant articles. So, Facebook devised a new ranking system that weighs "both new stories from the server and unseen stories from the persistent cache." The result should be posts you're more interested in reading, even if you're stuck on a train or in a refugee camp.
