I added Facebook comments to WP Mods last month. One of the things I was aware of when I added Facebook comments here was that comments would not be indexed by the search engines.
This looks all set to change as Google will now be indexing all comments left on Ajax commenting systems such as Facebook and DisQus. The change was apparently made today so any comments you’ve made via Facebook on blogs or websites should now be indexed in Google somewhere, though I’ve not found any comments I’ve made indexed yet.
This is great news for anyone who uses Facebook comments on their website as more content from your site can now be indexed.