True, the website might not be the answer right now. But if the audience grows and it gets press attention it might change the dynamic. (It's the first Bitcoin pay-per-character site, so it's got a press-worthy "Million Dollar Homepage" quality to it.)

Right now the only incentive to post on Bitcoin Megaphone instead of Facebook, Twitter, etc is that each post is also a bitcoin address, meaning the author can collect tips to cover the cost of the post. For example: http://bitcoinmegaphone.com/13yrmhc2CMvZyqPhhd7jpRnYWzVCAqHjxR/

Anyway, thanks for the comments. You raise valid concerns I'll need to address if the site is going to get more popular. (Full disclosure; I'm the developer ;-)