Social networks can be used for a variety of purposes. Some of the fun is creating a large pool of friends from many aspects of your life. That doesn’t mean all friends are created equal. Use tools to manage the information you share with friends in different groups or even have multiple online pages. If you’re trying to create a public persona as a blogger or expert, create an open profile or a “fan” page that encourages broad participation and limits personal information. Use your personal profile to keep your real friends (the ones you know and trust) up to date with your daily life.