URL Rewriting

Folks, I have wordpress installed on the root folder of my site. Some Rewrite changes were made to the .htaccess file by Wordpress.

The question I have is, if I wanted to forward domain.com/twitter url pattern to my twitter profile (http://www.twitter.com/user) how would I go about doing this?

So far I have tried the following:

RewriteRule ^twitter http://twitter.com/user

but this does not seem to work for me.

Thanks in advance for your help.