[EDIT: I just noticed that the 'What's New?' thread results page and the 'Watched Threads' results page could benefit from the above as well.]
[DOUBLE EDIT: I realized I should have searched for the above suggestion only afer I posted this. Maybe I should go to sleep now.]
My idea was...
Have an option in the user account management area where you can select whether you want the option to post to Facebook/Twitter/etc when you post a thread or even reply on the forum (in some cases a reply may be relevant).
If you selected Twitter integration, you would be given an alternative field that automatically prepopulates with the forum thread title, but that is editable so you can modify/optimize the post title for publishing on Twitter while also including certain relevant Twitter tags (or whatever you call them) that you would not want to feature in the thread title on a forum.
If you selected Facebook integration, you may not need the same alternate field that you would like with Twitter integration, but you may want to have one of the following options:
* - like your own thread under your Facebook account OR
* - post it to your Facebook wall
* - post it on the wall of certain Facebook friends
Not sure whether that is possible but it would be what I would want in a dream world. I apologize if my Twitter/Facebook lingo isn't right. Please ask questions for clarification if necessary.