JustMigrate will move your Posterous site to Tumblr for you - bit.ly/XY6NcN— Warren Ellis (@warrenellis) February 22, 2013
You will fall in love with the simplicity of Tumblr blog.
They have really cool mobile apps on iOS, Android and Windows Phone. You can create content anywhere anytime.
Tumblr has some awesome curators who will help you spread your post across faster using reblog.