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The researcher estimates the site received about 15 million U.S. visits for the week ending Sept. 24 vs. 1.1 million the previous week. The network's 13-fold gain in visits came five days after it opened the site to the public. Research from Google+ watcher Paul Allen showed a 30% jump in users in two days and a base of 43 million users.
Google's decision to open up Google+ came the same week that rival Facebook announced several bold changes to its site. The boost in visitors puts Google+ at number eight among most-visited social networking sites, right behind MySpace and up from number 54 the previous week.