Online information mixes the good with the bad; you have to learn to tell what is true.
Tips
history
Recorded in Qing scholar Yuan Mei's 《随园诗话》 comparing a great writer to the Yellow River, which sweeps mud and sand along with its torrent - great volume, but not all of it precious.
usage
Often paired with 鱼龙混杂 ('fish and dragons jumbled together') to describe environments where quality varies wildly - media, markets, online content.
