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googleGoogle在其的官方博客中宣布,已经索引了1 Trillion(1,000,000,000,000)独立的网页/URL,又一个里程碑。博客中是这样写的,

We’ve known it for a long time: the web is big. The first Google index in 1998 already had 26 million pages, and by 2000 the Google index reached the one billion mark. Over the last eight years, we’ve seen a lot of big numbers about how much content is really out there. Recently, even our search engineers stopped in awe about just how big the web is these days — when our systems that process links on the web to find new content hit a milestone: 1 trillion (as in 1,000,000,000,000) unique URLs on the web at once!

1998年索引了26 million(两千六百万),2000年索引10亿(1 billion),现在达万亿,the web is big…

Google并不是索引了所有的网页,根据网页的内容来决定是否索引,对那些内容相似或者自动产生的网页并没有索引。

Google的爬虫真是够辛苦的…

下一个里程碑是什么?1 Quadrillion?何时到达? 那个时候PageRank是否还在?会多长时间更新一次?

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