I think there should be two simple rules. All posts made in the community should be easy to find. That's why I didn't put the link so far. When you post from a community other than #marketfriday, you have to put the link, otherwise, you are not seen.
Apart from those two possibilities, you can also check the tag, if you want or if you have time.
Ha, ha... France and England; France and Germany; Greece and Turkey; Poland and Russia; Romania and Russia; Hungary and Romania, some of the countries that "love" each other a lot. This is Europe!