I like your tumblr, I found it by chance and I love this kind of retro thing, have more tumblrs just like yours so I can follow along too?
My friend @oldschoolsciencefiction does a lot of great stuff (he focuses a lot on TV and movies), as does @notpulpcovers (especially old scifi stuff). Notpulpcovers actually scans his own stuff and in good quality. I do that once in a blue moon.
And of course there’s my tumblr guardian angel @gameraboy, who did a couple posts that were tutorials on how to create a gif, which I’ve been using ever since in my own fumbling way.
@danismm is great, and there are a few clues here and there that lead me to strongly believe the account is run by a Hugo award winner. (Your secret identity is safe with me. By the way, when I was a WSFS member, I voted for your book.)
I feel guilty when I do posts like this because I feel like I’ve left some people out. If I did I apologize, but these are the ones that come right to mind, off the top of my head.