I hear good things about Tumblr from artists, I think because the platform encourages sharing, which gets your content in front of more people, on more pages, which drives traffic. And that's good for SEO. I even heard Matt Mullenweg praise Tumblr as WordPress.com's only real competition in terms of pageviews.
While Tumblr struggles to survive under Yahoo's management, it doesn't hurt to have more content out there to extend the reach of your brand, especially on a well-established domain. Additionally, Tumblr automatically adds your Instagram hashtags, which allows you to cast a wider net in terms of SEO keywords for your market.
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