As I scroll through Facebook Marketplace, thousands of high-end beauty products roll across the screen. From designer perfumes to luxury foundations, they're all on sale for a bargain price.
I click on a picture of a Nars concealer. Normally it costs £24 but these are selling for just £6. I message the seller and ask her to send one in my shade.
She sends me her bank details and I transfer money directly into her account.
But how will I know if it's the real deal? The truth is, there's no way to tell for sure - and at that price it's unlikely to be.
Online marketplaces are making it easier than ever for counterfeiters to sell fake cosmetics.
I looked into the worrying trend for the Daily Express.
