Confucius had many followers when he traveled among the states.
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从者 is literary and historical — used in classical texts and fiction set in earlier eras. For modern 'follower' (e.g. on social media) use 粉丝 (fěnsī) or 追随者 (zhuīsuízhě).
culture
Anime fans will recognize 从者 as the Chinese term for 'Servant' in the Fate/stay night franchise — heroic spirits summoned by Masters in the Holy Grail War.