Why Facebook profiles are Google-searchable?
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                Jose
            
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        Published on 2013-07-31T08:48:39Z
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            2013/08/02
            16:06 UTC
        
        
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Facebook has around 1B user profiles. They can be found by searching in Google. However, I don't think these profiles are linked from anywhere, so how could Google discover them?
As far as I know, sitemaps are not enough for that (http://webmasters.stackexchange.com/a/5151), as all URLs should be crawlable anyway.
I ask the question as I also have a site with user profiles and would like to make them discoverable.
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