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Can Facebook, Apple and Google keep powering tech’s growth?

Technology stocks have driven gains on Wall Street the past few years, but volatility in the first quarter could be a sign of serious doubts forming about the future of some of tech’s biggest names. Investors have already seen examples of the typical earnings response to these types of companies early in this earnings season: Netflix Inc. (NFLX) , the first big tech company to report, delivered a stunning quarter, revenue jumping 40.4%, and streaming only revenue jumping even more, up 43%, with a huge jump in subscriber growth, including its international customers. Doubts have been swirling around Facebook Inc. (FB) and Alphabet Inc. (GOOGL) , (GOOG) , which face data-privacy and other concerns, and Apple Inc. (AAPL) , which could report disappointing iPhone sales.