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LinkedIn hits 100 million users

Each week about 1 million people are joining, according to the professional-networking site.

LinkedIn announced today that it now has 100 million users.

According to the professional-networking site, approximately 44 million of its users are in the U.S. LinkedIn said that it's adding about 1 million new users to its service every week. The company reported that 20 percent of its members are in the service industry, while 9 percent of users are in the "high-tech" sector. Apple, Amazon, eBay, and Cisco are among the "most represented companies on its site." They're flanked by EMC and Campbell's.

LinkedIn, which launched in 2003, announced plans earlier this year to go public.

Although the United States is home to the biggest number of LinkedIn users, it can't compete with the growth LinkedIn is seeing elsewhere. The social network said that 2010 year-over-year growth in Brazil is 428 percent. Mexico, India, and France are trailing with growth rates of 178 percent, 76 percent, and 72 percent, respectively.

Of course, LinkedIn isn't the only social network that's enjoying continued success. Facebook currently has over 600 million active users around the globe, and that figure continues to grow. Twitter is watching 1 billion tweets hit its service every week, according to data it released last week, and about 460,000 accounts are being added to the social network every day.