Go to your profile page and click the settings button.
Click the “automatically import activity” link.
Click the blog/rss button, type in your blog’s feed, click import and you’re done!
You can also import your content/profiles from other sites like Flickr, YouTube, and Delicious. I’d recommend that you avoid importing too many because your don’t want to overload your friends’ Facebook newsfeed with all the stuff you’re doing online…