What is the reason for having more than one login link for Facebook?

If you do a Google search for facebook you'll see something that I think is rather curious, basically there are two different links, one to log into your account and the other to login to your account.

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The Log in to Facebook link has this URL: https://www.facebook.com/login/ It also has Log in to Facebook as the tab description, and Log In as the dialog title.

And the Login to Facebook link has this URL: https://en-gb.facebook.com/login/ But it has the same Log in to Facebook as the tab description, and Log In as the dialog title.

What is the logical (or perhaps illogical) reason for this?

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