由於TikTok當時正面臨在美國全面封禁的威脅，數百萬用戶失去了他們的聚集地，為了維系正常社交需求，大量美國人轉向小紅書。在中文互聯網上，這個遷徙被稱為「洋抖難民」。「洋」意為海外，「抖」是抖音的簡稱。
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For well-distributed points, nearest neighbor search is often near O(logn)O(\log n)O(logn) in practice. In the worst case (all points clustered tightly or along a line), it can degrade to O(n)O(n)O(n), but this is uncommon with typical spatial data.