Best answer - Susan Moskwa (Google Employee) Go to this answer
We've been telling people for a long time that they shouldn't focus on PageRank so much; many site owners seem to think it's the most important metric for them to track, which is simply not true. We removed it because we felt it was silly to tell people not to think about it, but then to show them the data, implying that they should look at it. :-)
我们长久以来一直告诉人们不要将注意力过多放在PageRank上,很多网站所有者可能认为这是一个重要的指标,事实上这是不正确的。我们将移除该服务,因为我们觉得告诉人们不要去想这件事,然后又向他们显示数据是愚蠢的。
PageRank是谷歌排名运算法则(排名公式)的一部分,是谷歌用于标识网页等级/重要性的一种方法,是谷歌用来衡量一个网站好坏的唯一标准。在揉合了诸如Title标识和Keywords标识等所有其它因素之后,谷歌通过PageRank来调整结果,使那些更具“等级/重要性”的网页在搜索结果中另网站排名获得提升,从而提高搜索结果的相关性和质量。
谷歌PageRank一般一年更新四次,因此刚上线的新网站不可能获得PR值。