Commonality

People in:

Faro, Portugal; Montreal, Quebec; Saint Petersburg, Russia;
Edinburgh and Glasgow, Scotland;
Mississauga and Toronto, Ontario;
Dortmund and Leipzig, Germany;
Chelmsford, Oldham and Manchester, England;
Perth, Melbourne and Sidney, Australia;
Durango, Mexico; Calgary, Alberta; Lima, Peru;
Zurich, Switzerland; Anakara, Turkey; Amsterdam, Netherlands;
Riga, Latvia; Haifa, Israel; Barcelona, Spain;
Paris and Rouen, France; Stockholm, Sweden; Vancouver, British Columbia ...

...all have something in common...

... They read Carolina Naturally.