No. When I had tried it I only had content showing from our site. Interesting idea of having an option in Discourse to specify for related content area to come from the AdSense matched content plugin. Perhaps a good plugin. Note that you lose control of having the topics be sepcific to the category, and some may not be relevant any longer (which could also be a case with related content)
Time is a factor that should probably be considered for suggesting topics. That why I like the idea of a recent posts area.