Good luck with Tumblr. I actually do have a Tumblr account. It was brain-meltingly counter-intuitive to set up (I had to ask my online friends for help at every stage of the process), and I have yet to figure out how to actually DO anything with it. AFAICT, it's just a way of racking up points for how many times something you post (which you re-posted from somewhere else) gets re-posted. And yes, virtually nothing in the way of genuine conversation, which for me is the point of "social media".