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You can check out my youtube channel at youtube.com/asillyllama. Please rate, comment, and subscribe to my videos!
The only reason I can think of is that you have hit your subscriber limit. Youtube has a limit of how many people you can subscribe to at one time without others subscribing to you. I'd wait a few hours then try to subscribe to the person again.
First, you must have your own YouTube account. If you do, go to that person's channel and click the "subscribe" button.
Several channels on YouTube upload The X Factor videos, some of which are: xfactor, thexfactor, thexfactoraustralia, TheXFactorArabia, XFactorIndia, thaXfactorarab2013, and hiptoeknee.
ErlendWin's Channel includes a variety of funny videos from YouTube. The page is called 50 Funniest YouTube videos of All Time. Users can subscribe to his channel and watch funny YouTube videos.