EviLClouD: Not really small but super annoying.
When you sell something on Facebook marketplace and agree on a price. Then when you meet up the other person tries to negotiate the price and eventually ends up not buying it. What a waste of time
Very annoying. Facebook can be more convenient than Trademe as there's no success fee and it's easier for people to contact you directly, but with no feedback requirement you get more time wasters and people not following through with payment or just not turning up when you've arranged a pickup time etc.