Youtube comments would not be something I’d consider useful or valuable most of the time. I’ve posted videos there that I never bothered looking back through the comments. The first lesson of Youtube: don’t feed the trolls. Since it’s infancy, Youtube viewers have been known for leaving comments that are often harsh, off-topic, spammy, or just rude.
Just a “heads up” that Facebook, Google+, Picasa, Youtube, and Pinterest all have major layout changes in store. Picasa has now merged into your Google+ personal profile photos. The other changes can be requested at: