Social network marketing leverages social media platforms like Facebook, YouTube, and Twitter by creating engaging content that users want to share. This viral sharing increases exposure for brands. Facebook is a powerful platform, with over 300 million active users who spend 50% of their online time on the site. Marketers can advertise on Facebook or create a branded Page to interact with fans and share updates. Other popular social networks include YouTube, where brands can post videos and ads, and Ning, which allows building a custom social network. The goal is to connect with people and start two-way communications to build an online network and promote websites and ideas.