That's a good idea :) You could maybe even have multiple heavyweight block chains and shard them out if they get to a certain size in GB too maybe.
I wish there was some simplified NPM Module to create blockchains. It'd be fun to try and prototype ideas with it. I was thinking a Twitter version of Steemit would be very awesome also.
Why don't we just store the images on ipfs and keep the ipfs hash in the metadata?
I wasn't aware of IPFS storage before you commented this (I'm still a learning dev haha) after doing a couple of Google searches and reading some things about it I definitely think that this is a great way to store media in an efficient and safe way. If anyone else is interested in learning about IPFS storage here is a link to the IPFS Distributed Storage Website. Thanks for the informative comment @picokernel :)
Never settle for less
~ Np