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SAN FRANCISCO — Suppose you were Mark Zuckerberg, recently ordered by an advisory board to decide how long former President Donald Trump should stay banned from Facebook. How do you make that decision without alienating key constituencies — advertisers, shareholders, users, lawmakers and others — while staying true to your own sense of what Facebook should be? It's a hypothetical exercise, but one that illustrates the high-wire act Facebook's leadership now has to pull off. Facebook's quasi-independent oversight board last week said the company was justified in suspending Trump because of his role in inciting deadly violence at the U.S. Capitol on Jan. 6.