For a small offline business I don't think it is appropriate to promote it in the internet. A food cart or laundry business would be better off to be promoted offline instead of pushing it to online promotion. But I have to agree that even small businesses can have a benefit when promoted online. I have been seeing posts in Facebook about vegetable trading (buy from the farm and sell to customers) and also other food stuff. The leverage is the existing delivery systems like Grab Food using a motorcycle.