Avoiding spammers using your site and annoying your visitors can be a pain, the spammers on the internet often add links to the comments sections on blogs or to the post signature on forums ad these if abused can put genuine users off using your site.

One of the easiest ways of deterring the spammers from your site is to use the “no follow” tag for forum post signatures, this puts a barrier to the spammer as he is after links that will help in the search engines but the “no follow” tag will not give him that search engine boost.

If you are using a blog you can set the comments so that they must be approved before being posted, this will also discourage the spammers from using your blog to post spam as it will never get seen by the search engines.