This has nothing to do with marketing (well, almost nothing) - rather, it's about the creation of the work in the first place.
Pinterest: Keeping Your Visuals Together
It started with my steampunk book - I needed a place to collect all the lush visual inspiration I was using to inspire the books (The Dharian Affairs trilogy - first book free!). Pinterest was perfect because I could create a "board" for the series and keep them all in one place for later perusal. I make my boards public (protip: you can make them private if you need them to be sekrit), just to share with my readers as I was creating. I found a vibrant community of steampunk enthusiasts on Pinterest! And my steampunk board has been cited in more than one review, so I know readers are finding (and enjoying!) it as I have.
Reviews: I will occasionally post reviews on Pinterest, but I find saving tweets on Hootesuite about reviews (directing back to the reviewers) is more effective... plus it doesn't clutter up your board.Tumblr: More Than Just Visuals
Tumblr is like Blogger and Twitter got together and had a baby: it's blogging content (anything from pure visuals to video to text missives pages long) but built to retweet (or "reblog"). I haven't done any actual blogging on Tumblr yet... just reblogging of cool content. And Tumblr is a Big Wide World... I found my way there because Pinterest just didn't have pictures like this:
Singularity is coming!
Tumblr and Pinterest Together
The problem with Tumblr is that it's a blog - content isn't organized, it's just one continuous long timeline. The problem with Pinterest is that the content isn't as diverse - lots of craft and fashion pictures, but not a lot of cyborgs. BUT... you can pin from Tumblr to Pinterest!
I take this image on Tumblr....
....and pin it to my Singularity board on Pinterest....
...and now I have all my stuff saved just where I want it (and for my Singularity readers to explore at their leisure - book coming in March 2015!).
My life is good again.
(Also I'm spending way too much time looking at pictures instead of writing - but that's a separate problem.)
Tumblr is The Conversation
Pinterest is The Scrapbook
NOTE: I'm just beginning to explore Tumblr - if you're an expert, educate me in the comments as to all the cool ways I can use it.