This story is developing. Please check back for further updates.
Click here for the latest on the markets.
Greece's stock market will not reopen on Thursday and may not open on Friday either due to technical issues at local banks.
Citi's Mark May says this is how Twitter can hit revenue forecasts next year.
Cramer made his remarks after the company reported quarterly profits and revenues.
Amazon is proposing a "drone zone" to make America's low altitude airspace safe for delivery, USA Today reports.