Social networking is a powerful networking tool, but its misuse can kill a career. That’s why knowing the etiquette of social networks such as Facebook, LinkedIn, and Twitter is key to leveraging these powerful assets. This article discusses how to build a useful social network without making the poor decisions that can cost project professionals their reputations and opportunities for advancement. In doing so, it reports a study conducted by CareerBuilder that shows that 37 percent of U.S. human resources professionals said they screen potential employees on social networks, and of those that vet via social media, 34 percent said they’ve found information that caused them not to hire the person. It then lists these seven ways to strike the perfect social networking balance: traditional networking rules apply; don’t over-share; damage control matters; engage; choose your network wisely; use your manners; and focus on the relationship, not the numbers. Accompanying the article is a sidebar showing how to start a social network.