Whether you’re picking up a neighbour’s sofa off Facebook, bidding on antiques on eBay or ordering a personalised cereal bowl from Etsy, you, and millions of others, are actually using an Online Marketplace. They’re a brilliant way to connect buyers and sellers but a recent Which investigation has found they’re also a hotbed of dangerous products. So what can you do to ensure what you’re buying is safe? Read more about our investigation, and find out what the companies had to say. You can also read B&Q's response here. Get 50% off a Which? membership.