Similarly, Tumblr is a micro-blogging platform -- people are on it because they precisely DO NOT want a full blog. I remember Posterous founders specifically saying they don't want to be compared because Posterous is not that (http://news.ycombinator.com/item?id=680087), why go after these people now?
Wordpress? So far, all they've been doing are incorporating features that Wordpress already has and not really changing the experience all that much either... which then begs the question, what's the big goal and how is it different?
It seems to me that their moves align with getting on AS MANY USERS AS POSSIBLE -- and if that means attacking all peripherally similar services, then so be it. It seems that their only goal is a large exit due to a large user base, not really product vision.
I see a couple of takeaways here for fellow hackers and Posterous:
- Really think about what your product is and what your big vision is. Are you really just creating yet another Wordpress.com?
- Is it the post by email that is the uniquely awesome thing about Posterous? Someone should put together a universal "Post by Email" service and test this theory. Have it connect to Wordpress.com and Tumblr and see if people buy.