Tumblr is basically a network of blogs where you can follow blogs of content you like, and it all shows up on your "dashboard" in chronological order. Then if you want you can start your own blog and post your own stuff, or re-post other peoples content on your own blog.
I love it because it's pretty great inspiration for my photography. I am exposed to all sorts of great images and inspiration on my dashboard on a daily basis....cars, photos, architecture, quotes.....and it also fuels my Porsche-lust........which is a bad thing, but I can't help myself.
My girlfriend is on Tumblr and she follows a bunch of people who have "fit" blogs and health blogs....so she gets motivational stuff come up, and cool recipes, workout routines......etc. she's addicted.
It was also Tumblr that inspired me to focus on my health again. I changed my diet, started working out......dropped 40 lbs and haven't looked back......because of this picture:
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