Professional social networking site LinkedIn has announced a new milestone (along with an accompanying infographic, below): more than 200 million members. By far, the United States boasts the most LinkedIn members, and the site is most used by those who work in information technology and services.

Trailing the U.S. and its 74 million LinkedIn members are India with 18 million accounts, the UK and Brazil, each with 11 million users, and Canada with 7 million members. LinkedIn reports it is seeing the fastest growth in Turkey, Colombia, and Indonesia.

After the IT industry, the top industries using LinkedIn are financial services, higher education, computer software, and telecommunications.

As pointed out by Liz Gannes at AllThingsD, the figure LinkedIn is touting is the number ofregistered members, not active monthly users (which LinkedIn won't disclose), so take that figure for what you will. On monthly active user figures among competing social networks, Facebook reports 1.01 billion, Twitter has 200 million, and Google+ claims 135 million.

LinkedIn launched in 2003, reached 50 million users in October 2009, and 100 million members in March 2011.