Posterous might not have been as big as Tumblr, but it was big. It was obvious it's management had some lack of vision, since introducing Spaces and other confusing additions.

Even with all this, it is completely confusing to me seeing it sold to Twitter and just shutting down service.

I personally will not believe to use any service made by those guys, especially Posthaven looks ridiculous in light of how Posterous got miss-managed.

Having said all this, I am not judging founders for selling out, I think they did a good thing and it is their absolutely their right, probably could've gotten way more from someone else, but it's their decision, as online user, I just can't touch anything they make.