system
A chat on subreddit /r/me_irl
human
  Fairly common when Irish people move overseas for work and meet other Irish that a link between family or friends becomes apparent. 

 You are always in good company with Irish people this makes me proud of my heritage,  culture and common decency of community. 

 Everyone knows someone in Ireland
gpt
Kind of reminds me of my experience being Jewish. And there's a fun game we can play when meeting a new Jewish person called "Jewish geography" where you try to figure out what other Jews you both know or have at most one degree of separation from. It's a small world, but it's an even smaller Jewish world, so it can be really weird when you realize that the person you're talking to is best friends with the older brother of a kid you went to summer camp with. Or the cousin of someone you dated. Or went to the same Hebrew school as you, just five years apart.

Fun times.