State of the stock market on Thursday

Facebook (NASDAQ:FB) shares fell 3.1% on the New York Stock Exchange premarket on Thursday after the social media giant warned of a significant slowdown in revenue growth in the current third quarter and next.

Shares in Didi Global (NYSE:DIDI) soared nearly 40% after the Wall Street Journal reported that the company's biggest backers may take it private just weeks after its IPO in New York to appease Chinese regulators. However, after the company's rebuttal, the rise was reduced to 14.5%.

Shares in PayPal (NASDAQ:PYPL) fell 5.5% after the online payments operator warned of a "short-term slowdown" in revenue growth, missing second-quarter profit expectations.

Shares of Merck (NYSE:MRK) fell 1.2% despite quarterly revenue beating analysts' forecasts. Good sales of its cancer drug Keytruda helped offset declines in sales of some of the company's other drugs.

Shares of Uber Technologies (NYSE:UBER) lost 5.1% after Reuters reported that SoftBank (T:9984) will sell about 45 million of its shares in the taxi service to make up for other losses.

Ford (NYSE:F) shares rose 4.4% after the auto giant reported a surprise second-quarter profit thanks to a surge in prices for some vehicle models.

Yum! Brands (NYSE:YUM) also added 4.4% after the fast-food restaurant chain owner's quarterly results beat expectations thanks to the U.S. economic recovery.

Shares of Comcast (NASDAQ:CMCSA) climbed 1.7% after the entertainment giant's second-quarter revenue beat forecasts on higher ad sales and the reopening of theme parks.

Shares in Hilton Worldwide (NYSE:HLT) fell 0.8%, despite the hotel chain achieving quarterly profits and forecasting solid growth in the second half of the year as tourist arrivals recover. Its shares were up more than 7% last month.

Qualcomm (NASDAQ:QCOM) shares added 3.2% after the chipmaker reported revenue growth of more than 60% from a year ago on higher smartphone sales.

Royal Dutch Shell (NYSE:RDSa) shares rose 4.8% after the oil company significantly increased its dividend payout and said it would buy back $2 billion worth of shares, helped by higher oil prices.