The stock market, as we have recently seen with the GameStop furore, can be a bit of a rollercoaster. Investors are at work trying to use both better information and ever faster trading algorithms to profit from the market.
Speed and information are an interesting pair. Remember, an important reason why people trade is that they want to realise their information into to make a profit. That information could be a tweet or something far more fundamental, like a careful analysis of a company stock.