Google is using Search to propel their social network. They might say it’s “not a social network, it’s a part of Google”, but no one is going to buy that. They were late to the game in social and this is the best catchup strategy ever.
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http://parislemon.com/post/15627530949/antitrust
Twitter has already responded to the announcement stating their discomfort in having their data excluded from Google search, no word yet from Facebook. Not sure how confortable I feel having Google curate the internet for me based on their business objectives.