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By "leap the fence" I mean spread to a new audience, who are not interested in the topic of the tweet but in the tweet itself as an (apparent) instance of some heresy. But whether that happens depends on a lot of random factors you can't predict.
It's also unpredictable, for similar reasons, when a tweet will become unusually popular. Some tweets get 10x the likes I'd have expected, others 1/10.
