Facebook was one of the first apps to link directly with iOS — a huge upgrade that let other apps easily log in via Facebook ID, and it turbocharged photo sharing. The app used to be notoriously slow (due to a brief and disastrous flirtation with HTML5), but today Facebook provides one of the best mobile experiences ever, and new features like Instant Articles and 360-degree video promise to take things even further, even if some people are annoyed at Messenger being spun off into a separate app.
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Credit: Mashable