Let's say you publish a manifesto online (on a blog, Facebook, forum, etc...). Chances are it won't be taken seriously because anyone can easily publish anything these days. But if you publish it on a billboard or a full-page newspaper ad, people will definitely take notice. These days "cost" is a rough measure of "importance."

That's why I'm fascinated with the dynamics behind "Bitcoin Megaphone" (http://bitcoinmegaphone.com). Is there anywhere else online where people can anonymously post messages and prove their seriousness by proving how much it cost to post? I see this as a new style of mass communication; like "proof-of-work" but with "proof-of-cost". What do you think?