Wall Street is buying what CEO Mark Zuckerberg is selling. There are reasons for this optimism - and reasons to question it.

E-commerce giant Amazon reported strong earnings Thursday but, like its big tech peers Microsoft and Google, saw its stock price fall on concerns over high AI investment costs. The mounting expenses ...

Alphabet CEO Sundar Pichai said the company is planning another big year of spending as it continues to build out its artificial intelligence offering. TakeAway Points: Sundar Pichai, the CEO of ...