But here I want to clarify that the exchanger I mean is myself without creating a specific platform, or in other words I only send coins from my address to the buyer's address.
TThen it's okay. I see some users suggesting escrow but I'm not sure if it's really needed only for exchange service for network fees because it ensures small transaction amount.
I will promote my business on social media.
This means you open a service here and make a promotion outside the forum? Handling I think will be too complicated, you should have more specific rules. Social media is known as a hotbed of scammers.