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The following numbers are impressive, given that Google+ marketing hasn't yet begun.
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It will be fascinating to see whether Facebook, which has a very big head start and hundreds of millions of satisfied users, or Google+, now only a few weeks old, which, once you get a free Google+ account, has a spot on the new, nearly ubiquitous, black Google toolbar, reaches a billion users first. Note: Each time you connect with any of the Google services (a billion people do each month), you see this new toolbar across the top of your browser.
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Stay tuned ….
And/or click here for more overview.