Two reasons: people form habits early and young people are hard to reach. The first one is simple: Facebook and other social apps are about network effects and

Two reasons: people form habits early and young people are hard to reach. The first one is simple: Facebook and other social apps are about network effects and habits: checking daily to see what your friend are up to, while sharing the same. I'm not sure what the stat is in the past year, but for every year since it started the most stunning stat to me was that 50% of their users checked every day. When the habit starts to erode the network effects can cause acceleration, raising questions about Facebook's future. The other reason is that teens are a very hard demographic to reach. Twenty years ago, companies could air commercials on MTV, put ads on FM radio, and create full page ads in magazines to reach teens. Today, teens are doing a lot less of this. As a result, companies that can reach these younger audiences can charge a hefty premium due to scarcity. You're a highly desirable demographic as well -- 25-44 with disposable income. But they already have ways to reach people like us.