The only advantage Posterous has is built-in comments. Yes, you can use Disqus on Tumblr, but it's a bit of hack, and Disqus has it's own issues. Regardless of

The only advantage Posterous has is built-in comments. Yes, you can use Disqus on Tumblr, but it's a bit of hack, and Disqus has it's own issues. Regardless of your opinion about comments, it should at least be an option for a blog. But here is where Tumblr wins, you can't include any JavaScript in your Posterous theme (http://posterous.com/theming/porting http://posterous.com/theming/porting). So if they don't support a feature you want (like comments or TypeKit), you can't add it on your own like you can with Tumblr.