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This sounds like it could be solution. We will also need people to somehow verify their exchange...photographs? What @anthonyadavisii as also a concern in my mind, but I'm still looking for a solution to this possible scenario and will need a few days to brainstorm it. For now, maybe we can just post items for sale like @macchiata mentioned:

I found this to be a good idea but well maybe not only giveaway but if someone sells secondhand paperback book ( Preferably mythology book or classic novels) I am down to exchange with some SBD. Like the Amazon or Ebay style ^^

Verification photo isn't a bad idea. I'd be glad to help out with providing bot code. We just need to figure out the requirements for like filtering out spam comments. I have an idea for that using the upvotes of trusted agents to be a 'tag' if you will of good comments and then the randomization function can be run against those. Feel free to reach out on steemthat.and we can talk more.