Reddit has made it clear that it’s an ad-first business. Today, it expanded on that practice with a new ad format that looks to sell things to Reddit users. Simultaneously, Reddit has marketers who are interested in pushing products to users through seemingly legitimate accounts. In a blog post today, Reddit announced that its Dynamic Product Ads are entering public beta globally. The ad format uses "shopping signals," aka discussions with people looking to try a product or brand, machine learni...