OK - maybe this works better - only appears on the first post of a topic. Better?
Allows people to easily post a topic they 'like' to their FB page, which exposes it to all their 'friends', many of which of course are not DTT members etc. The more the merrier.
Bottom line is with nearly a billion people actively using Facebook on a regular basis, it's impossible to ignore and while there are a ton of good reasons to not use Facebook at all, it's kind of like there are a ton of good reasons to not drink beer or eat bacon.