WeChat groups are designed to be private (as opposed to being public, not necessarily to protect privacy). To join one you normally have to know either the admi

WeChat groups are designed to be private (as opposed to being public, not necessarily to protect privacy). To join one you normally have to know either the admin or a member of the group. A QR code for public access is available but it's forced to expire in seven days. So for a regular sized group of a few dozen people, it's relatively easy to spot a stranger.