网站徽标如果是家庭和后缩略图，如果是单... facebook和wordpress

I want my wordpress site to show my site logo if is home or a custom page, else if is a single it should show the post thumnnail on facebook. And with description I have to do it but in php I don't know what did I do wrong Here's the code of description:

<?php
    if(is_home||is_page(array('oktato-videok','cikkek','hol-csajozz','hol-randizz','galeria','treningek')))
    {
        echo "This is the default wordpress descrition";
    }
    else
    {
        echo wp_title();
    }
?>

If you could help on the description I can make the sufficient changes on my own.

Thanks a lot!

is_home is a function and should therefore be written like is_home().

Link to the Wordpress Codex: http://codex.wordpress.org/Function_Reference/is_home