[post] ] Tesla stock is falling again in early Tuesday trading. The likeliest reason isn’t related to the electric-vehicle maker’s Shanghai plant or even price-target actions at a broker. No, the drop is probably because of the social-media platform Snap . Snap (ticker: SNAP) warned investors revenue would be weaker than expected Monday evening at the J.P. Morgan Technology, Media and Telecom conference. “Well, the macroeconomic environment has definitely deteriorated further and faster than we expected when we issued our guidance for the second quarter,” said Snap CEO Evan Spiegel. “So even though our revenue continues to grow year-over-year in...