How can I diplay the title of the article on Facebook wall with wordpress and share.php
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My Environment

 - PHP 5.3.2
 - WordPress 3.4.1

I an managing a wordpress site and I want to share a post link in the facebook.
There are some article in one page (index.php).

then I use the following link for diplay the title of each posts.

    <?php while (have_posts()) : the_post(); ?>
    (snip)
    <a href="http://www.facebook.com/sharer/sharer.php?u=<?php the_permalink(); ?>&t=<?php the_title(); ?>" target="_blank">share</a>
    (snip)
    <?php endwhile; ?>

However I click the link and the share title and link are the wordpress itsself (not article's ones).
Is it the problem of facebook cache? and How Can I solve it?

Many thanks in advance.