Hamburg, Germany

LinkedIn, the social network focusing on business connections, is getting a run for its money as Xing plans to enter the US, one of LinkedIn's biggest global rivals, reports CNNMoney.

Based in Hamburg, Xing is popular in Europe. It also boasts a recent partnership announcement with ZoomInfo, a business information search engine catering to industry, companies, and business people.

Xing's 2 million members will have access to the profiles of around 36 million business people in ZoomInfo's database. Its entry into the US market will be the clash of two titans, as LinkedIn has 11 million members and adds 180,000 members every week.

While LinkedIn rakes in the revenue via online advertising, Xing relies entirely on a fee-based premium service, which touts a 17 percent conversion rate in Germany.