Anonymize all your external links with the href.li service.
You can use this plugin to prevent your site from appearing in the server logs of referred pages as a referrer. The operators of the referred pages cannot see where their visitors come from any more.
For example, this plugin will automatically convert all external links to this format
This is an anonymous link to example.com which prevents the original site from appearing as a referrer in the log files of the referred page.
Plugin based on the WP Blank Referer by blackhatzen.