when the childhood moves are over but the questions aren't
An adult third culture kid is someone who grew up between cultures and is now building an adult life - often in yet another country. The moving may have stopped, but the patterns it built (fast friendships, easy goodbyes, a fuzzy answer to "home") show up in dating. Oh My Person is built so that background is visible up front instead of explained on every first date.
An adult who spent a significant part of their childhood living outside their parents' culture - usually across several countries - and carries that experience into adult life, relationships included.
Not inherently, but many ATCKs describe patterns from childhood moves - building connection quickly, detaching quickly before a goodbye, or feeling restless after a few years in one place. Knowing that about yourself and a partner helps more than avoiding it.
No - anyone can join. It's built around a cross-cultural background as a first-class part of the profile, which is what makes it useful if you are one.
Also see
