Why you should refresh your content
There are two main reasons why content refreshes matter: SEO and brand image.
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To rank well
Several things go into this. First of all, Google prefers fresh content — to the point when simply changing the publication date will initially fool its algorithms. Of course, the search giant will catch on after crawling your page and finding no new content — so don’t change the date for the sake of it.
Secondly, you can improve all your main performance indicators by updating content: time spent on a page, clickthrough rates, conversions. Fresh content will have an effect on your business goals too!
Thirdly, any decent SEO specialist worth their salt will tell you about the importance of backlinks (i.e. when other sites link to yours because of your authority). When you publish an in-depth helpful piece on something, others will start linking to it. But the opposite is true as well: if your content goes stale, sites will remove their backlinks to improve the experience for their users.
Finally, refreshing content allows you to avoid content cannibalization — a situation when several pages on your website compete for the same keywords. The main problem with cannibalization is that Google does not know which page is the main one — and so they choose one as primary and one as secondary, often basing the evaluation on which page provides better UX. Merging several competing pages into a single big one will allow you to avoid this.
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To maintain your brand image and authority
People come to expect certain things from brands. They’ll trust Forbes for business advice, the Economist for political landscape analysis and Harvard Business Review for advice on management.
To establish yourself as a leader in your niche, you’ll need the content you publish to stay relevant. Outdated facts, links and general info will lead to brand image erosion and distrust from your target audience.