The change number shows the difference versus the previous 3 month period.
Learn more about Alexa's Data Unique Visitors and Pageviews The number of people who visit this site and the number of pages they view.
Site owners who install the Alexa Certify Code on their website can choose to display their Certified Metrics, such as Monthly Unique Visitors and Pageviews, if they wish.
There is not necessarily a link between the upstream site and this site.
The "Sites Linking In" count shows the number of sites that Alexa found that link to this site.