Negative Off Page Techniques May Include

• Avoid using "Free - For - All" link directories , Link Farms, or any other type of directory or service that provides unedited and unverified links. These are frowned upon by search engines.
• Do not spam your link on any blog, guestbook, feedback page, or any way to artificially insert your site URL links in any way that hurts the content and disrupts the service of another website. For example you "Spam" your website URL on a guestbook of someone elses homepage. This type of spamming technique not only will likely get your site penalized and banned by search engines, but also disrupts the websites of others. 
• Avoid excessive "cross linking" of your own websites to inflate your inbound links. Cross linking multiple sites you have is many times a natural means to serve the visitor relevant content. However excessively cross linking to duplicate content of your own will likely result in your site being penalized.