I use Twitter and Facebook just about everyday. Instead of going to each site I like to be able to post one status update and have it go to each. I am using TweetDeck which is available for both MAC OS X and Windows. This is a small client to have running on your workstation to post update statuses. Then if you want your Facebook to pull in your twitter status then simply “allow” it on Facebook here -> http://apps.facebook.com/twitter/.

TweetDeck Mac OS X Client

Facebook Twitter App