Twitter and Snap are running up big gains in 2018, while Facebook is lagging
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Facebook Inc.'s stock FB, -0.18% has mostly stalled in the first few months of 2018, but Twitter Inc. TWTR, -2.19% and Snap Inc. SNAP, -3.64% are on a tear after being largely overshadowed by Mark Zuckerberg's belle of the social-media ball. Uncertainty about major changes to Facebook's newsfeed …