Noah Read, on his blog, on why he is posting “snippets” to his site which then get distributed to the social networks of his choice.
Some of the content is so great that it seems a shame to be dumping it into 3rd party services, which may be gone within a few years. Microblogging and social sharing will survive, whether or not the current players do.
Then, in a later post on decentralization:
The reason I write on my own blog instead of Medium is the same reason my social posts originate from my snippets feed and do not begin on Twitter, ADN, or Facebook. I control my own site and it will remain in my power after all these properties have died or changed their focus, chasing whatever they need to please their investors.
The trend continues.