The 5, sometimes 6, questions expats ask one another upon meeting...
1. Where are you from?
2. How long are you going to be here?
3. Is this your first assignment overseas?
4. What company brought you here? (not always in the mix...or may come later)
5. Where do you live in Tokyo?
6. Where do your kids go to school?
Then apparently you are friends. Just takes a little more effort than a facebook friend.