By Maria Duron The recent years have brought about the huge growth and popularity of social and business networking sites. Though people were skeptical in the beginning that these sites would really work, nowadays, most people and businesses have realized that these networking channels have opened up opportunities that had not been available in the past. LinkedIn is the largest business networking site online, with over 120 million users and still growing. As a direct seller, you may have set up a profile with LinkedIn, and you may occasionally visit the site to keep updated with what's happening, but are you really using this site to the best of your advantage? Have you realized the various ways you can use LinkedIn for building your business? Though you may think that LinkedIn is great for increasing your sales, the real power of this business networking site is that it's a powerful tool for building and maintaining relationships. Successful companies and entrepreneurs know t