From our small city in Alberta (Medicine Hat ~65,000 pop’n) we had a reach of over 500,000 (more than 7 times our population) on one of our (get this) road safety posts about a particularly troublesome highway intersection through town. There were 428 comments on that post - one that even took the time to say “I’m in Texas, why am I seeing this?”
Just goes to show you: you’ll never really know what will perform best until you try it!