By the way, no a like box is not "silly," it is a subscription to a facebook page, which is valuable to a businessperson, not just a "vote" for their post.
There are a lot of bloggers who feel this way. Time will say if it's really hot or not. While we wait for the great internet historian's verdict, we might still like to use it to get connected...
I have figured out a way to add a Facebook Likebox in a wordpress.com blog.
Please note that the Facebook Likebox is visible only when the reader clicks a text link, but it DOES then open right in your wordpress.com blog.
And you can put it almost anywhere you want - post/page/side bar/footer/header-widget.