Note: There are two (three) AJAX technologies, the
iFrame (hidden frame) and the
The XMLHttpRequest Object technology. The last technology is worst for indexing, since it gives nonunique pages.
It has been assumed that frames are bad for
SEO. But, as far as I know, Google themself, has used a combination of the two technologies because the first is better at giving unique content. It gives the same result when you use the back button in the browser.
Why should it be problematic for Se BOT to crawl and index a framed page? Zero frames have been related to spamming the index. But a zero frame is an essential part of the framed AJAX technology, since the asynchronous communication takes place in the zero (width and height) frame while content is presented in visible frames.
It should be possible for a Se BOT to identify the different "AJAX" frames as "separate pages" and index them as such without using the noframe tag. It should also be possible for an advanced Bot to identify and analyze the content on the hidden frame and raise a red flag if it is identified as spamming the Bots index.
Conclusion:
I am unsure of how important the noframe tag is. Is there anything about this in the SE companies guidelines? It should be related to
AJAX and SEO.