Spot trading means you’re not technically “buying” the cryptocurrency, but instead trading your USD for it through either a market or a limit order. A market order means you agree to trade for the currency at the current market price. A limit order lets you put in a designated price at which you want the trade to occur, and when the currency reaches that price, the trade happens automatically. These orders then incur “maker” (for limit orders) or “taker” (for market orders) fees — though on Binance.US, there’s just a standard 0.1% fee.
What Happened: According to Binance U.S. market data, the Bitcoin to the U.S. dollar trading pair on Binance U.S. flash crashed within a minute from $65,815 to $8,200. This translates to a drop of 87% for the world's top cryptocurrency on the exchange according to cited market data.

Crypto-marketing. A scheme in which promoters of securities tied to cryptocurrencies recruit investors to pitch the investments, often to friends and family and through social media and blogs. In return, these investors are promised a generous return plus the promise of commissions on their sales.
This happens when the promoter of a digital token draws in buyers, stops trading activity and makes off with the money raised from sales.