LinkedIn is a business-oriented social networking site mainly used for professional networking. As of October 2009, it had more than 50 million registered users, spanning more than 200 countries and territories worldwide.

Salespider.com is The Largest Free Social Network For Business Owners and Entrepreneurs and Includes Free Sales Leads & Prospect Lists, Free Classified Ads, Free Business Directory, Free Business Videos, Free Business Chat Rooms, and Free Business Forums.

ZoomInfo is a vertical search engine focused on people, companies, and the relationships among them. In addition to using the public web as its source to automatically create professionally-focused summaries of the people and companies it finds, ZoomInfo has partnerships with Reunion.com and XING to provide additional data.