Facebook founder Mark Zuckerberg already have an account on the new social network Google +. There are 39 people in his circle at this moment, including technical director of Facebook Bret Taylor, and over 20 thousands of users added Zuckerberg to their circles.
"Google" Tag
Mark Zuckerberg has registered on Google Plus
Google Plus One VS. Facebook Like

Recently a new service called +1 has been introduced by Google. A new option offered by Google represents a real rival to the Facebook’s Like button. Plus one helps to estimate what exactly people are interested of and concerned about.
Google Adsense is out of Facebook’s Advertisment Providers List
Recently the social network Facebook published a renew list of advertisement providers that are allowed to be used by the account holders of Facebook. Google search engine is not on this list. That means that Google Adsense, for example, can’t be used in order to generate revenue within a Facebook application.
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Google’s Social Search vs. Facebook
Google announced integrating social media in to latest search engine. They managed to do so without mentioning Facebook in an entire blog post.
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