brotherhood_of_LAN - 12:23 am on Sep 25, 2012 (gmt 0)

>Facebook

True, but only if you have javascript enabled. When it's disabled Facebook the content is loaded into HTML, so any bots would still see the base content of the page. fwiw I don't think FB's really interested in letting spiders see content anyway.

When JS is enabled the actual served content of the "page" (before any interaction) is still 'there' (within commented out HTML), but their JS puts it into the DOM. From what I understand of the OP's post is that the page content is not available on the page load, so can't be put into a <noscript>, or anywhere for that matter.... without an extra HTTP request.