bitcointalk? reddit? telegram? or other?
Would you use an escrow service? Or would you prefer to conduct transactions face-to-face?
Which escrow service you use? paypal or other?
I typically sell my unneeded goods for fiat since it's a lot easier to find a buyer that way. But if there comes a time I have to, escrow is definitely a must for online transactions and for that, I would consider the escrow agents in bitcointalk first.
If there were a completely on-chain application that could help you solve the trust issue without escrow,
would you be willing to give it a try?
But how would this work? or do you mean the application would be the acting middleman/escrow in the situation?