The old keeps being new again.<p>Every time someone tries to create a new platform that will finally open up the Internet to the long-standing promise of widespread two-way communications, the same thing keeps happening: The platform turns into a broadcast medium where a few use it to promote something and the vast majority sit back and consume. BBS systems, E-mail, USENET, almost all message boards, Reddit, Facebook, Twitter, etc. You can change the protocol, make it Web-2.0, limit it to 140 characters, add AJAX, but you can't change human nature.