Facebook for iPhone recreates the website in a width and height more suitable for the phone's size, with more prominent buttons and links to make them easier to access using a touchscreen.
The site includes all the normal features of the main Facebook web version, including news feed, messaging and status updates.
"The iPhone has not even been out for two months but has already changed the way people think about the mobile web," Facebook engineer Joe Hewitt wrote on the company's official blog.
"Today we are taking our first step into that new mobile world with a new Facebook website designed just for iPhone."
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