
PageRank Matters
This might be known but worth repeating. Google assigns a PageRank to every page based on hundreds of factors and one of them is in-bound links — the more in-bound links point to a website, the better its PageRank. Well, inevitably this created a scope for manipulating the PageRank of a website by creating many artificial in-bound links to a site in a process called ‘link spamming’ resorted to by ‘black hat’ SEO professionals. For example, you might post a ton of comments on blogs where you post a link to a particular site and if every such instance of a link were to add link juice to the site, then Google’s PageRank metric would get fairly manipulated by unscrupulous folks in a wrong manner. Hence, Google introduced the rel=nofollow attribute which has syntax as shown below. <a href=”https://www.mysite.com/”rel=”nofollow”>my site</a> So, to ensure the integrity of the PageRank metric, Google Webmaster guidelines suggest the use of the rel=nofollow attribute in certain cases. These include:- Untrusted content — When you link to a web page whose content you don’t want to vouch for. These might include when users post comments on blog posts with a link to their site. Once you use nofollow, spammers will hopefully get discouraged as they will stop benefiting from their comments once their comments are all nofollow-ed. Once Wikipedia suffered from this problem of people posting links in Wikipedia references just to get PageRank, they made all their reference links nofollow. This was a broad brush solution which probably should be more nuanced such as letting trusted Wikipedia editors post links that are dofollow rather than nofollow.
- Paid links — When you are posting links on your sites as part of a paid scheme, then you should specify that it’s a paid link so that Google’s ranking algorithm does not get manipulated in an unfair manner. It makes sense to use rel=nofollow in such cases.
- Log in pages — There is no point in having Google crawl a log-in page or registration page on your website. Hence, it makes sense to use rel=nofollow for those pages. This way of controlling precisely where your link juice flows inside the website is an instance of PageRank sculpting.