I agree, sometimes the comments are more fun than the funnest of funniest posts. I also love reading good debates with differing opinions in a respectful manner. I don't know that I personally need to bookmark comments. For me it's like instant gratification and with so much content to search through and read for responsible curation, I don't know that I have the time to revisit someone else's comments. It's hard enough keeping up with responses to my own!