OK, that's not what I was hoping for. :/
Looks to me that your server's apache isn't setup to allow .PHP includes directly in HTML files.
Try this:
<!--# include virtual="raterank/nextdoor/raterank.php" -->
If that doesn't work, then we'll either have to:
1. Go with iframes.

2. Add an entry to htaccess to parse html for php
3. Get your server admin to adjust apache to parse for php.
Lemme know how this last experiment goes.
