Joe Biden was being taunted online on Thursday with the hashtag 'Empty Shelves Joe', as frustrated shoppers complained about shortages of products in their local stores, and concern grew about possible Christmas shortages. Twitter users posted pictures of empty shelves at stores around the country, as the nations supply chain crisis continued. Biden on Wednesday acknowledged the concerns. 'With the holidays coming up, you might be wondering if gifts you plan to buy will arrive on time? -snip- Earlier on Wednesday, Jen Psaki, the White House Press Secretary, had sparked alarm by saying: 'We are not the postal service or...