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IMHO, no. Its easier for Google to use +1s as an indicator to measure social reach since it is their own data. Contrast this to: [1] Facebook and LinkedIn: most shares/likes are private by default [2] Twitter: Google would have crawl Twitter's entire corpus and tweet stream. It could do it, but Twitter's increasingly restricting access to this data.

So it makes sense from a technical perspective that Google can use only the limited information available to it in terms of social strength of an article.




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