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Adding a post to steemit will be optional when you add an image. I'm thinking a simple checkbox will do.

That sounds perfect dude! Well done!

A thing to think about is that the image in the Steem blockchain provides proof that you were the original creator. So it might be worth creating a second account to upload images?

That's a good idea... I definitely wouldn't be opposed to that if it proved that I created it and got credited soforth. Nice idea @carn.