A new AI tool created to help identify certain kinds of substance abuse based on a homeless youth's Facebook posts could provide homeless shelters with vital information to incorporate into each individual's case management plan. Credit: CC0 Public Domain

Facebook users in Pittsburgh and other western and central Pennsylvania locations have found themselves transplanted to Philadelphia for a day.

A on the social media site caused Pittsburghers and others to receive Facebook notifications welcoming them to the City of Brotherly Love on Wednesday.

Facebook says a "bug" with the site's location services application caused the problem and was fixed later Wednesday.