Make ze tumblr. Not enough good directional tumblrs.
I will probably not remember to open this thread but on tumblr I would follow lickety split.
Can you post it in here? It seems like the reblog/source attribution element of the system covers basic use cases. I know that things like tumblrs posting nothing but links to movies on YouTube, etc., have been shut down by C&D's from you-know-who in Hollywood, but my impression is that generally original content creators are encouraging in their support of the free viral marketing reblogging of JPGs creates. I'm not saying it's impossible, but as a non-commercial enterprise I'd wager it's in the same ballpark as posting pictures you googled on a message board thread. I may be wrong: can't say I actively follow Internet IP as it intersects with things like blogs. Feel free to edify.
It's one of those things where you start it so you can, as you intend to do, follow some blogs, then you suddenly find yourself posting your own material and pretty soon it takes over your life. In other words, fun ahead! One of the few instances where I've found the synergy of interface and content to be perfect.