For the next #Conversations_im release I’m refactoring how URIs are linked / made clickable. I’m adding a bunch of URI schemes like tel and mailto on top of the existing xmpp, http(s) and geo but removing support for "things that look like web URLs but aren’t actually URIs" (like 'example.com') to avoid some false positives.
Once the 2.18.0-beta comes out tomorrow or so let me know if you see things that isn’t matched and should be matched or vice versa.