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fb.com is just two letters for most people.

I cant imagine why facebook the site and facebook-mail have to be in different addresses. Most likely the mail feature will be surfaced within the facebook UI. Right now, fb.com redirects to facebook.

The Fb.com address is probably just a convenience for both facebook and its users.

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There is a an argument for having separate domains so that official correspondence from a website is not easily spoofed. Consider someone creating an account 'payments@facebook.com' or something similar.

I agree; the scammer/malware heuristics of regular internet users are likely going to treat fb.com as a false positive. Consider the fact that Facebook's hundred-million demographic comprises people like these: https://www.readwriteweb.com/archives/facebook_wants_to_be_y....

Good point.

They can always use it for URL shortening.

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