Stocks in free fall; Twitter in trouble; Uniqlo's 4-day work week

U.S. stocks (^GSPC) continue to be under pressure after yesterday's biggest selloff on Wall Street in a year and a half. Again, concerns about China's economy--  this time, weak manufacturing data-- are weighing on investors here and across the globe.

Yahoo Finance Senior Columnist Michael Santoli says with that, along with falling oil prices and fears about the impact of a Fed interest rate hike, investors are having a tough time staying optimistic.

"There's just too much pressure being applied from too many directions," he explains. "Even with the ugly selloff in the U.S. yesterday, the China news managed to shock on the downside, which does show we haven't quite gotten flush yet."

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Deere sales tank

Here are some of the stocks the Yahoo Finance team will be watching for you today as we near the end of the earnings season.

Deere (DE) The farm equipment maker beat estimates for both profit and revenue in the period. However, sales fell 20% as Deere continues to struggle with a downturn in the farm economy and lack of demand for big construction machines. And the company expects equipment sales to drop 24% in the current quarter.

Hewlett-Packard (HPQ) The big PC maker's fiscal third quarter earnings topped estimates, but revenue fell short. HP continues to be hurt by the slowing demand for personal computers as sales for desktop units sunk 20% in the period. Hewlett-Packard also says it is moving ahead on its plans to spin off its printer and PC units into a separate company.

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The Gap (GPS)  Like Hewlett-Packard, its quarterly earnings met estimates while revenue missed. Sales fell at both the company's namesake stores and its Banana Republic outlets. However, it saw gains at its Old Navy locations. The Gap says results were hurt by the strong dollar, the West Coast port strike and its strategic moves to increase business.

Intuit (INTU) The maker of TurboTax software reported a smaller-than-expected loss in the quarter, but revenue came up short. Intuit says it will shed its Demandforce, QuickBase and Quicken units so it can focus more on small business customers and income tax filers. Intuit is also boosting its dividend by 20%.

Google (GOOGL) The company renaming itself "Alphabet" will have a new, stand-alone company within it.  Google announcing that its life sciences division that makes smart contact lenses will become a standalone company within the new conglomerate. Previously it was part of Google X.

Twitter troubles

Amid the market turmoil this week, one of the names crushed this week - Twitter (TWTR). Shares of the company have been scorched, tumbling nearly 6% alone yesterday to a new record low and at one point falling below its IPO price of $26 a share.

They’re calling it a ‘Cloud Tax,’ but it sounding more to consumers like a Netflix (NFLX) tax. As the Wall Street Journal notes, more consumers turn to streaming video on services like Netflix and Hulu, and music on Spotify, states are looking fill the taxes lost on the sale of tangible media goods.

In Japan - where 100 hour work weeks aren't uncommon, fast fashion retailer Uniqlo is now offerring workers 4-day work weeks, instead. The 4-day, 10-hours a day option will come to Japan first, but the company hasn’t ruled out offering it internationally.

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