Thread: please check my syntax

please check my syntax

Hi,
in single-ad_listing.php I have tried to place the following code. which I thought would generate a link so that a person can reply to a classified ad by way of private message to their inbox.

<?php echo '<a href="http://www.facebook.com/dialog/send?app_id=233213216763358&to=' . get_the_author_meta('user_email')">

this should be appending the email address of the ad poster after the &to=

but im not typing it right. could somone please suggest to me where I am going wrong?

many thanks
Brad