You are also including displace.php. Could that be causing the extra lines ?

Look at the source of your page output: http://www.socialemo.com/rss.php

(view in browser, then view source)

There are 10 empty lines before the <?xml tag. They have to come from somewhere....

There are spaces and empty lines before the first tag... make sure you remove them.

This is the header I'm using:

<?xml version="1.0" encoding="ISO-8859-1" ?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">