According to industry insiders, the Google+ social-networking service will have a total of 400 million members by the end of next year. Google's social networking site is currently adding about 625,000 new users a day. The site's popularity has accelerated in recent weeks, with almost a quarter of its total user base having joined in the month of December. Google, the world’s largest Internet-search company, aims to challenge Facebook's status as leading social networking site.

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