Go with Wordpress/Ghost(self hosted) if you want to own your content.
Another thing, many startups use Tumblr because they like it not to be hosted on the same server, so that if your website goes down, your blog will be still up. Tumblr has social features, auto posting to social networks, and all the features listed above except the fact that you're hosting your content on Tumblr servers. Which I don't think should be a problem.
Another thing, many startups use Tumblr because they like it not to be hosted on the same server, so that if your website goes down, your blog will be still up. Tumblr has social features, auto posting to social networks, and all the features listed above except the fact that you're hosting your content on Tumblr servers. Which I don't think should be a problem.