|Twitter co-founder Biz Stone helped lead the company to a reported $7 billion valuation.|
Facebook is adding a food-ordering service to its platform, while Spotify's fourth acquisition of the year centers around artificial intelligence.
After 18 months with a buy rating on the internet radio company, Macquarie analyst Amy Yong downgrades the stock.
Stocks snap back from their worst losses in eight months seen a day earlier.
Sirius XM has begun talks with Pandora about a possible acquisition.