Quickly go viral online? They don't need that dorky promotion to accomplish that, just post it on their website and Lost fans will watch.
A "viral" video is something that people watch because it's amusing or intriguing to anyone and everyone. A Lost video isn't "viral", it's just a preview that Lost fans will watch...the method of delivery won't add or subtract viewers.
I am curious to see how the story line unfolds this last season. Watching the episodes last season, I found myself drifting to other things as opposed to watching every single frame...I was more interested in the general path of the story than each minute of each episode.