Last night Tumblr users signed on to see "Marissa Nystrom, will you marry me?" bannered across their dashboards, whether or not they followed proposer Justin Johnson's blog. The link goes to this genuinely thoughtful, romantic, and well-edited video, but I presume his girlfriend follows his blog. So the only reason I can see to link the video to the world is to consummate its place in the controversial genre of public marriage proposals.
Public proposals seem unabashedly confident at first, but only the most heartless, unafraid-to-make-a-scene askee would say no. Put it on video and not only is he not asking her in person, but he's putting pressure on her to say yes in front of the largest stage of all. And when it's online, you can't leave your audience behind.