Meta Platforms, Inc. (META), TikTok's parent company ByteDance, and Alphabet (GOOGL), the parent company of YouTube, are facing a landmark jury trial in Los Angeles, accused of employing addictive designs that harm teenagers; Snap Inc (SNAP) reached a settlement last week, and executives including Mark Zuckerberg are expected to testify in court. Meta's stock fell 0.3% in early Tuesday trading, while Alphabet's Class A shares rose 1.2%.

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