How to automatically post from Twitter tweets to Facebook?
Twitter to Facebook: http://twitter.com/widgets/facebook.
How to automatically post from Blogger to Twitter?
If you are using Google's FeedBurner, then just go to FeedBurner, click on the one of your feed, then Publicize tab on top, then “Socialize” on the left.
If not, just signup at http://feedburner.google.com/.