yey. i am more in favor of twitter integration compared to facebook.
people prefer to keep their facebook profiles secretive considering it is more personal and has more private data.
twitter on the other hand allows you to create multiple IDs. and use them as per your convenience. i have have a work based twitter account and a personal twitter account. on Facebook, it is just one personal account.
Bringing up an old-ish thread...
I think the real features I'd need out of this one are:
Push new status update from XF to your Twitter account w/ a link to your XF profile.
Pull new status updates from Twitter to your XF account.
Authenticate via Twitter (same as FB Connect, except with Twitter's OAuth).
Just a quick related suggestion, when posting a new thread I think it would be beneficial to having a check box that says something like 'Share this on twitter too' - then if they have authorised the forum to connect to twitter it automatically posts the title and link on their twitter account, or if they haven't it directs them to the page to authorise their account
So this was posted in 2010.... Still waiting for full Twitter integration (by that I mean including log-in). A lot of my traffic comes from Twitter, not Facebook. So adding Twitter would be nice. (Google too while we're adding this).