Dogecoin -- a digital currency favored by Reddit traders that was initially started as a joke eight years ago -- is certainly no exception. Not all cryptocurrencies are created equal -- and I'm not saying that digital currency can't have a place in a long-term investor's portfolio -- but the fact remains that these types of investments are incredibly speculative buys that carry a tremendous amount of risk. One major player that's perhaps less talked about than well-known names like Amazon or Shopify is MercadoLibre (NASDAQ:MELI), the largest e-commerce company in Latin America.