I would find it useful to know which forums people subscribe to so as to see what plants interest them. But there seems to be no way to find this information.

If I was looking for someone I use to go to their profile to see which forums they watch then look for them in those forums. I see they are no longer shown in your profile. This won't work for everyone Rita but badges are a good indication of interest. Hope that helps.

Duh! I didn't even think to look at the badges

You can see what threads a person posts on, and that tells you what forum the post is in, and it gives you a good idea where some one hangs out