A disclaimer on your website is a simple first line of defense from frivolous lawsuits. It should reside in a persistent place on your website. You should have a link to it on every page of your site. On this website it appears in the footer of the page.
I would hope no one intentionally breaks the law. In this age of digital media sometimes things are done unintentionally. A violation can be as simple as someone placing a comment on your blog. A standard disclaimer is simple enough to post on your website. When I build a website it is standard practice.
Feel free to copy and paste a disclaimer for your website!