businesses and professionals find Facebook's "white noise" and Twitter's

brevity useful – but a new business person signs up to LinkedIn every

second of every day, making its potential viral impact phenomenal. Some

simply post résumés or "hang out" with clients, while others are digging

deeper in discussion groups. Like all web-based networking, the site

presents risks for users who may accidentally tip off the competition

about new projects. Spammers also love it. But LinkedIn aficionados just

keep on making new connections. Here's how.