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Facebook does not want Google on their side at all, just look at their robots.txt
Big move - Google will crawl more contents and links. But we need to keep moderate the links on comment (this will create spam opportunity to spammers). Can we set up no-follow links on Facebook comment box?
In particular, Google can now index Facebook comments as well as those on some other social sites such as Disqus or Intense Debate. See [techmeme.com...] for more detail.
Google crawls the URL, yummy-sundae.html.
Google begins indexing yummy-sundae.html and...decides to attempt to render the page.
During the render, yummy-sundae.html automatically sends an XMLHttpRequest for a resource, hot-fudge-info.html, using the POST method.
I use Wikipedia text in some of my image heavy pages, but I load the text through AJAX so bots can't see it. Could this now possibly affect my rankings, if G is able to load that text?.
If I understood this video from Matt Cutts, something like that would probably be considered cloaking, which could possibly get you into trouble.