The other day I was hit hard on one posting with a spamrun. Not uncommon unfortunately, lost of Viagra pushers and real Rolex shifters post comments at many blog sites. While looking in to it, I saw that moments for the spamrun a real human was visiting that same node with a weird referrer URL. (S)he was Googling for "powered by drupal" "post new comment".

On the result of that query you will find a posting of mine around position 6. So thats how they find sites for dumping their nonsense comments, just FGI! Not that smart, I would use the same way of finding a Drupal site where I could post a comment, google for it.

But Google is smarter then the scum of the earth. You want to see? Go to Google looking for "powered by Drupal" and "post new comment". You will see lots of Drupal sites. Now go to the pager at the bottom and click "next page" or click a random page number. And again. And again. Do it a couple of times and you will hit a page like this

We're sorry...

... but your query looks similar to automated requests from a computer virus or spyware application. To protect our users, we can't process your request right now.

We'll restore your access as quickly as possible, so try again soon. In the meantime, if you suspect that your computer or network has been infected, you might want to run a virus checker or spyware remover to make sure that your systems are free of viruses and other spurious software.

We apologize for the inconvenience, and hope we'll see you again on Google.

See? If you look for something that can be used, you are being served. If you look too much and most likely want to misuse that data, you are blocked. Cool, Google is protecting the blogosphere and Drupal in particularity!

Now dont try to Google to much for words to find out how to get blocked, because in the end you will. I once was at a customer location where a couple of hundred users where behind one NATted IP address. There has been a roque client that did automated searches on Google. The result was that all those hundreds of real users where blocked and needed to fill in a CAPTCHA to continue using "the startpage of the internet".