Kuala Lampur, Nov. 24 -- I have a 4.5 rating. It isn't my ride-share or food-deliver rating. This is my Carousell rating.

Carousell is a fast-growing online marketplace in Singapore.

It's grown so quickly over the last three years that "to Carousell" (ie to sell an item online) is a real Singlish verb and I am genuinely embarrassed by my rating.

That loss of half a star was caused by one buyer I left hanging after striking up a conversation.

This haunts me.

On Carousell, your online rating can make the difference between winning or losing a bid.

After all, a lot of the app is predicated on trust. It's largely person to person sales with a few big stores or retailers using it so you trust that on offer made is genuine or that payment...