By Evelyn M. Rusli
The Wall Street Journal
"LinkedIn was long an ugly duckling of social media. Investors puzzled over its hybrid consumer-and-enterprise business model." LinkedIn was founded in December 2002 and it was officially launched on May 5, 2003. Its primary use is for professionals who want to build their resumes. Another of its primary uses is its professional networking.
As of January 2013, there are more than 200 million users of LinkedIn and it is used in about 200 countries in the world. "LinkedIn also is pushing into content by aggregating business news and hosting expert blog posts, to give professionals more reasons to linger on the site."
Read More: Wall Street Journal