The New York Times reports: PBS's “American Experience” has sent its documentary “Earth Days” on a film festival and 40-city theatrical tour for the last year, before its television broadcast in April. Now the 102-minute film about the origins of the American environmental movement, from director Robert Stone, is planning for another outlet, a presentation on the social networking site Facebook. Users will be able to watch communally and interact with the filmmaker and the “American Experience” executive producer Mark Samels in real time. Go to the AmEx website.