What's the effect of redirection?

I can see the links posted on a restricted forum (for example Google) are rewritten to a redirection in the form of

Code:

http://www.chw.net/foro/redirect-to/?redirect=http://www.google.com

now, what's the effect of this? I mean, the landing URL will still be able to detect my site as the source of the link but not the current thread it came from? or it won't detect my site whatsoever?

Your site will not be listed as referring URL in target site logs.

woohoo