https://marco.org/2009/12/11/when-tumblr-first-came-out-i-started-an-account
When Tumblr first came out I started an account and posted little things on the side but didn’t link to it anywhere. After a month or two I realized I had posted loads of content there and nothing to my primary site. So it seemed logical to switch.
— Garrett Murray, interviewed by Chris Bowler. This is why I switched completely to Tumblr, too, despite having run my own homebrew CMS for years prior.