The New York City Media Lab hosted an event on April 11, 2012 highlighting innovations in Social Advertising. StumbleUpon's Jack Krawczyk talked about how the brand opportunity in social media is becoming one with the content experience.
To become part of the content experience, brands must focus on presenting their content in a manner which is native to the underlying user experience. For facebook: drive to stories which are published by friends. For StumbleUpon: drive to web pages. Both are inherently native to their respective products and drive strong results for brands.
To learn more, chat with Jack: @JackK