SetEnvIfNoCase Referer "^http://www.andivista.de/" local_ref=1
SetEnvIfNoCase Referer "^http://andivista.de/" local_ref=1
SetEnvIfNoCase Referer "^http://www.google.de/" local_ref=1
SetEnvIfNoCase Referer "^http://google.de/" local_ref=1
SetEnvIfNoCase Referer "^http://www.google.com/" local_ref=1
SetEnvIfNoCase Referer "^http://google.com/" local_ref=1
SetEnvIfNoCase Referer "^http://www.twitter.com/" local_ref=1
SetEnvIfNoCase Referer "^http://twitter.com/" local_ref=1
SetEnvIfNoCase Referer "^http://www.facebook.com/" local_ref=1
SetEnvIfNoCase Referer "^http://facebook.com/" local_ref=1
Order Deny,Allow 
Allow from env=local_ref
Deny from all