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tedster - 7:41 pm on Nov 1, 2011 (gmt 0)
In particular, Google can now index Facebook comments as well as those on some other social sites such as Disqus or Intense Debate. See http://www.techmeme.com/111031/p54#a111031p54 for more detail.
(Note: the fragment identifier gets broken if we post a live link - so please copy/paste.)