Mine is better but this is simple and works I suppose. On mine you create a list of users that you want to "like," and it will only "like" their videos.
I thought it was a fake (it's only one line of code!!!), but it worked :)
As Photodeus says, this doesn't help anyone.
Only because you start playing a movie doesn't mean you actually enjoyed it (no, Youtube isn't Facebook where you press *like* on everything)
Just plain silly, defeats the purpose of having ratings or a taste.