There are PCs out there, at this very moment, trying to add spam to blogs and websites including this one. As regular visitors to the forum know I've been plagued with this problem several times over the years. I've lost entire forums and had the previous forum reduced to a state where nobody could join.
This website is based on the Drupal content management system, an opensource framework that lets you (fairly) easily add features and content to your web pages.
One of the add-on modules that I used is called Mollom, it works in collaboration with other Mollom users to keep spam at bay. The graph here shows the attempted plcement of spam on this website (orange) and legitimate comments and forum posts (green) Hopefully as time goes on the green will overtake the orange!