Samsung is set to release its latest iPhone challenger tonight -- the Galaxy S4. Is the Korean company starting to challenge Apple's coolness? And, as the Interactive session of South by Southwest in Austin now gives way to the film and music folks, a lesson from the festival on shifting digital media to silliness, and to silliness plus real journalism. Jonah Peretti is founder and CEO of the popular online media website Buzzfeed. He says the change is part of the website's natural evolution, along with the social web itself.