I like what Amit states here:

Start with titleless posts as the base, making them first-class citizens. Stitch the design around that. And then add support for titles. People latched on to the microblogging phenomenon of Twitter and Facebook because they made posting interfaces frictionless

Well… let’s not forget the network effect of those silo’s and how their Like and Tweet buttons showed up overnight in the blogosphere like the zombie fungus in “The Last of Us”…