Facebook自2004年年初开始运营，用了将近4年时间拥有了1亿用户，但仅仅5个月过后，这个数字达到了5亿。

Launched in early 2004, it took Facebook nearly four years to add its first 100 million users, but only five months to add its most recent batch.

youdao

Facebook自2004年年初开始运营，用了将近4年时间拥有了1亿用户，但仅仅5个月过后，这个数字达到了5亿。

Launched in early 2004, it took Facebook nearly four years to add its first 100 million users, but only five months to add its most recent batch.

youdao