Auto-Update with a Facebook Application
If you’re looking to automatically post your Twitter updates straight to Facebook, the Twitter application (by Twitter) is your best bet. It’s pretty darn simple to use as well: just install the application and then click to allow Twitter to update your Facebook status.
Those of us who are loquacious Twitterers might opt instead for the Selective Twitter Status application, which will only update your wall with tweets that include the #fb hashtag.
Facebook Page admins have a few additional options. One such option is Involver, which is actually a suite of Facebook applications for Pages. The Twitter for Pages app essentially just adds a Twitter tab with a collection of tweets to a Facebook Page. It’s a nice alternative for brands and companies who want to showcase their Twitter presence without over-updating their Page’s wall with an influx of tweets.
Check Jennifer’s Post for Other Methods