<?php do_action( 'bp_before_member_header' ) ?>
<div id="item-header-avatar">
    <a href="<?php bp_user_link() ?>">
    <?php
    $large_avatar_uid = $bp->displayed_user->id;
    global $wpdb; $large_fb_avatar = $wpdb->get_var("SELECT meta_value FROM $wpdb->usermeta WHERE user_id = $large_avatar_uid AND meta_key= 'facebook_uid'");
    ?>
        <img src="http://graph.facebook.com/<?php echo $large_fb_avatar; ?>/picture?type=large"/>
    </a>
</div><!-- #item-header-avatar -->