Wǎngluò shàng de xìnxī hàorú-yānhǎi, biànbié zhēnjiǎ yóuwéi zhòngyào.
Information on the internet is oceanic; telling real from fake matters all the more.
Tips
history
Attested in the Sui-dynasty monk Shi Zhenguan's 《梦赋》: 浩如沧海,郁如邓林, 'vast as the azure sea, lush as Deng's grove.' The variant 浩如烟海 cements the 'misty sea of writings' image.
usage
Canonical partner is 文献 / 古籍 / 史料 / 资料, written material in overwhelming quantity. Don't use it for physical objects or crowds.