Even though I used matched content option in AdSense for my websites there are some issues I faced. One of them is that publisher has no control over the recommendations shown to the user/ reader via matched content. I have a subcategory (subdomain) under one of my website domain. When I used the matched content on the main website, it also shows the content from the subdomain in the suggestion list. Today I find out that AdSense solved this issue and they introduced more control settings in matched content. Go to Settings > My Sites > Matched Content; then select the domain. Three settings for matched content recommended article is describing below
Time freshnessIf you don’t want to show old content in recommendation use this setting.
Any time: Google optimize the reader interest, similarity, and age of content. Google will recommends newer and older contents.
Most recent: if you don’t want to show very old content select most recent. Exact how recent is depends upon the frequency of content publishing. For more frequent publishing, recent content means last few days. Recent might mean last few months if you don’t publish content frequently.