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Under the flag dialog, 'Closing > Duplicate' on Stack Overflow will not allow me to enter a URL to Facebook Stack Overflow ( However, the same dialog on Facebook Stack Overflow allows me to enter a URL on Stack Overflow.

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Because Facebook.SO is a subset of SO. – Robert Harvey Feb 4 '13 at 18:49
@RobertHarvey right, but the duplicate parser should probably be smart enough to find the "real" URL (just chop off facebook.) so people don't have to manually butcher URLs – Ben Brocka Feb 4 '13 at 19:55
up vote 2 down vote accepted

This has been fixed; you can use either the main or subdomain question url on either site when choosing the original of a duplicate.

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