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The simple reason... Forms on the internet can do anything from register somewhere to rateing a service to requesting a quote.
You could even have Googlebot making purchases by accident, it would be chaos.
You could even have Googlebot making purchases by accident, it would be chaos.
As it happens, the Googlebot is one of my best customers, it regularly orders large consignments of diode pain relievers to be shipped to an address in Santa Monica ;-).
Seriously though, has anyone ever observer the bot following the address in a <form> tag? I'm tempted to run an experiment.
However, I am certain that the toolbar is responsible for certain urls being indexed. If the url is that of a form action, it may appear that Googlebot has followed the form. It is for this reason, that I would say putting a NOINDEX robots meta on form action pages is to be recommended. Indeed, I have done exactly that on some Perl code I'll be uploading in the next day or so.
Kaled.
Google won't ever follow forms. This is simple common sense. Unless, of course, it could read the context 100%, and that sort of AI is a long way off.
I use r*boform and it pretty darn good at figuring out how to fill in forms. You can even customize it so it's 'smarter than the average bear'. If something like that can be developed on the outside, I have to imagine the PhD's at the plex are at least that smart.