GooglePlus a social network site created by Google.


Google+ (pronounced and sometimes written as Google Plus, sometimes abbreviated as G+) is a multilingual social networking and identity service[3][4] owned and operated by Google Inc. It was launched on June 28, 2011.[5] As of December 2012, it has a total of 500 million registered users of whom 235 million are active on a monthly basis.[1] Unlike other conventional social networks which are generally accessed through a single website, Google has described Google+ as a "social layer" consisting of not just a single site, but rather an overarching "layer" which covers many of its online properties.


Before launching, Google+ was originally called Google Circles, a name alluding to its emphasis on organising friendship information.[7] The service was launched as an invitation-only "field test" in June 2011.[8] Early invites were soon suspended due to an "insane demand" for new accounts.[9] On September 20, 2011, Google+ was opened to everyone 18 years of age or older without the need for an invitation.[10] It was opened for a younger age group (13+ years old in US and most countries, 14+ in South Korea and Spain, 16+ in the Netherlands) on January 26, 2012.[11][12]
Google+ integrates social services such as Google Profiles, and introduces new services identified as Circles, Hangouts and Sparks.[13] Google+ is available as a website and on mobile devices. Sources such as The New York Times have declared it Google's biggest attempt to rival the social network Facebook,[14] which has over 1 billion users.[15][not in citation given] Google+ is considered the company's fourth foray into social networking, following Google Buzz (launched 2010, retired in 2011), Google Friend Connect (launched 2008, retired by March 1, 2012) and Orkut (launched in 2004, now operated entirely by subsidiary Google Brazil).
In November 2011, Google+ was integrated into the account creation process for other Google services, such as Google Mail.[16] According to independent analysis of its growth in December 2011, the site was adding an estimated number of 625,000 new users a day, which may total 400 million members by the end of 2012.[17][18] However, on February 28, 2012 Todd Wasserman from Mashable reported Google+ users are only spending 3.3 minutes monthly on Google+ which is a downward trend from 4.8 minutes in December and 5.1 minutes in November compared to Facebook users currently spending 7.5 hours using Facebook monthly.[19]


According to Joseph Smarr, technical lead on the Google+ team (former Plaxo CTO) Google+ is a typical Google web application: it uses Java servlets for the server code and JavaScript for the browser-side of the UI, largely built with Google's Closure framework, including the JavaScript compiler and the template system. They use the HTML5 History API to maintain good looking URLs in modern browsers despite it being an AJAX app. To achieve fast response times Google often renders the Closure templates on the server-side to render it before any JavaScript is loaded; then the JavaScript finds the right DOM nodes, hooks up event handlers etc. The backends are built mostly on top of BigTable and Colossus/GFS, and other common Google technologies such as MapReduce.[2]


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