If your blog outputs an RSS feed you can use Facebook's "RSS Graffiti" application to post that feed to your wall in Facebook. There are other RSS Facebook apps as well; just search "Facebook for RSS apps"...
Get PHP SDK from github and run the following code:
<?php
$attachment = array(
'message' => 'this is my message',
'name' => 'This is my demo Facebook application!',
'caption' => "Caption of the Post",
'link' => 'http://mylink.com',
'description' => 'this is a description',
'picture' => 'http://mysite.com/pic.gif',
'actions' => array(
array(
'name' => 'Get Search',
'link' => 'http://www.google.com'
)
)
);
$result = $facebook->api('/me/feed/', 'post', $attachment);
the above code will Post the message on to your wall... and if you want to post onto your friends or others wall then replace me with the Facebook User Id of that user..for further information look out the API Documentation.
Harish has the answer here - except you need to request manage_pages permission when authenticating and then using the page-id instead of me when posting....