Recently I purchased a facial mask from a Korean E-commerce website. This brand has been running that facial mask promotion via all the social media. Every time I check my Facebook and Instagram, the ad pops up. I see so many positive comments about this facial mask and the experiment in the ad looks super effective. I clicked the link and saw the promotion. The price looked fair, so I made an order. After a few days, I didn't receive any update. Then, I contacted them through email, Instagram, and Facebook to check my order status. However, no one responded. I checked its website, and all the products are out of stock. Excuse me? After over a week, they finally replied to my email and told me that the ship was going to be delayed. From a consumer side, this experience makes me re-think what things are matters for E-commerce promotion. Know Your Stock Limited For brands, promotion probably is the fastest way to boost sales in the short term. If you push promotion too much,...