Thanks to their powerful network effects, social networks have been hard to dislodge once established. Even if newer services break through — think TikTok — the sheer weight of user numbers usually assures older networks a place.
由于强大的网络效应，社交网络一旦建立就很难被取代。即使有更新的服务出现——比如TikTok——庞大的用户数量通常也能确保老牌网络的地位。
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