Facebook Ads setting help !

Hey guys, just want to ask when we set the audience location in the facebook ads setting, there is a meter down there (refer picture below) showing that how broad/specific of our audience selection…

My problem is when i am going to promote a viral post in my facebook page, should i set it to a very specific location until the meter point to "specific" level or just "fairly broad" will be fine?

Should i just set it between the middle (the green line) then will be fine? Because, whenever…

Facebook Ads setting help !