How to prevent unity from showing inappropriate random online videos?

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http://askubuntu.com – When I open the Unity Launcher and click on the last icon for videos, I get three lists: Recently seen, My videos, Online videos Online videos is listing videos, that I consider highly inappropriate (for example a video trying to convince people with a live threatening dease to have faith instead of visiting a doctor). How is that list generated? How do I deactivate it? Why does it show those videos instead of videos I relate to? (I am the only user of this computer) Edit: I am not referring to porn, but religion. I am fine that such context exists and is findable when searched. But I don (HowTos)