Here’s my current hypothesis, though I can’t test it:
- Use the link/share button under the post to generate a link. That link contains your user info.
- Post the link somewhere else—Twitter, Reddit, whatever. Your user info in the link should let Discourse know that you’ve shared it out in the world when it’s used.
- Have a forum member who is not you click on the link.
I tried this myself, but since I’m me …
EDIT: I made this work by creating a 2nd forum account and having that one logged in when I followed the link from another site. If your post is public, you can work in pairs instead of going to the trouble of setting up a dummy account.