Are you using RSS Feed directories to syndicate your blog? Do you have a Business/Fan page in Facebook? If you are utilizing the notes application in Facebook your readers can subscribe to your notes via RSS feed, just like you are importing your blog into your notes via RSS Feeds. I subscribed to my own notes (and was in Internet Explorer, tried in Fire Fox but it didn’t give me the link for the feed, maybe someone who knows how to get that can comment) and choose IGoogle to follow the subscription.