UPDATE: Facebook told CBC on April 21 that it has fixed the problem. "Halifax, Nova Scotia (former city)" has been corrected back to "Halifax, Nova Scotia." The company's spokesman didn't say what was originally behind the change.

Facebook users in Halifax are finding out the social network doesn't seem to think the city exists anymore.

Halifax as a 'former city' on Instagram.

People who have posted that they currently live in Halifax or are from Halifax on their Facebook profile might be scratching their heads. In recent weeks, profiles have been changed to say "Halifax, Nova Scotia (former city)."

Instagram shows the same thing when photos are geo-tagged as Halifax.

"I didn't think that many people moved out west!" joked one Reddit user.

Some discussed on Reddit what was behind the change: A glitch, or was Facebook making a belated political statement about the 1996 amalgamation of the Halifax Regional Municipality?

Halifax is a former city, Facebook?

Several people concluded it looks like Facebook scrapes its place names from Wikipedia, and a recent merger of 2 Wikipedia pages on Halifax might be behind the change.

CBC News has contacted Facebook to ask what's behind the change.