Why am I so slow and neglectful in replying to Facebook comments and such? Because I rarely log on. I really only use two things for outgoing information: Twitter and blogger.
I do get email for Facebook comments and messages from folks. My biggest problem is that I often see them on my phone at at time when I can't easily reply. Then I forget about them. I have the same problem with email, too.
Maybe I'll try to log on more often and catch up.