It was excitement when Posterous reported that it had been acquired by Twitter in March 2012. However it is being turned off on April 30. However, if you actually read in between the lines of the announcement by Twitter when the acquisiation took place, you would realise that Twitter was actually interested in the people, not the product or platform.
A pointer to the fact that Twitter wasn’t interested in the platform is the fact that even after it purchased Posterous, Twitter’s corporate blog remained on Google’s Blogger. (Mind you, Posterous is a blogging platform too).
Sachin Agarwal, Founder and CEO reports that they are turning off posterous.com and their mobile apps in order to focus 100% of our efforts on Twitter.