How to add WeChat as a Social Link in a Member Profile on FTH?

Part of the issue might be that WeChat is basically a phone app with the PC login as an addon, whereas Facebook, Twitter and so on were originally standard web portals with the phone apps being a later addition. I don't know how to link to a phone app, except with QR code.

Maybe I can investigate in a few days time, but I'm not in a position to do so at the moment.

I think you're on the right track Jane. I'm no expert in this area, but a friend working on a similar problem passed this along to me.

Weixin released an update 6.3.25 on 2016-09-05, which blocks almost all URL schemes request from non-weixin's application. Only requests from weixin's applications and some "white-listed" applications are allowed.

stackoverflow.com/a/41297068/2464