It has been almost a year since nofollow tag came into seoer's vision. In more than a year, seoer's attitude towards the nofolow tag has gone through a long period of reflection from distrust to acceptance, and then to gradually attach importance to the tag. The meaning of using nofollow tag is to tell search engines not to track links with this tag, and not to transfer weight to the links captured, so as to prevent weight loss. Today, many webmasters have also recognized the important role of nofollow tag in preventing weight loss, but this has also resulted in excessive dependence and abuse of nofollow tag by many webmasters. As soon as you see the links without keywords on the site, you will be directly given a nofollow tag, just like many webmasters find themselves changing friendship links when they see websites with high pr, no matter what the other party's Baidu weight is, whether the snapshots are new or not, or whether they are new or not, they will be directly exchanged, but they do not know that they have caused the concern of over optimizing tags. Nofollow is a very important label, but also because of its importance, we have to use it more reasonably and grasp a "degree" of optimization to achieve our goal of optimization. The following is a case study of the most successful SEO optimized industry websites, to see how these high weight websites can grasp the "degree" of nofollow tag.

1. Wanbiao.com (currently the most weighted watch mall website) includes 46800 pr5 Baidu Weight 6 Total number of links on the home page 405 Number of nofollow links used 30 Utilization rate 30/405 * 100%=6% (the use of nofollow tag is relatively reasonable)

2. Jufengshang (currently the second ranking website in terms of weight, previously the first) includes 46800 pr5 Baidu weight 5 Total number of links on the home page 223 Number of nofollow links used 95 Usage rate 223/223 * 100%=42% (the usage rate of nofollow tags is too high)

(Note: The following figure shows the use of Jufengshang Watch's nofollow tag. It can be seen from the code below that Jufengshang Watch's nofollow tag is widely used in article links, which is suspected of over optimization. During this period, the weight of Jufengshang has declined, and the author believes that more or less of it is related to the over optimization of the site's tags.)

3. OL Jewellery Network (currently the most weighted Jewellery Network) includes 55600 pr5 Baidu Weight 7 Total number of links on the home page 240 Number of nofollow links 35 Utilization rate 35/240 * 100%=14% (nofollow tag is relatively reasonable)

4. Doido (currently well weighted jewelry website) includes 1500 pr5 Baidu Weight 4, the total number of links on the home page 207, the number of nofollow links 67, the utilization rate 67/207 * 100%=32% (the utilization rate of nofollow tags is too high)

Although the overall weight of the website has a great relationship with the website's operation and optimization strategy, it is also affected by multiple optimization factors. However, it can still be seen from the above data that the weight of websites will be more or less affected by the use of nofollow tags. Here, the author believes through data survey that nofollow tags must grasp a "degree", and it is best not to use more than 20% of the total number of links.