The net is a callous place
Imagine spending a month frequenting a community locale, every day, maybe 3 or 4 times a day, and then just one day - you don't show up.
Do you think you'd be missed? Probably. But on the net you can participate in some collection of discussions for months with some social network community forum and then - just stop. And you'll never be missed. The online world just doesn't care if you show up or not.
If fact, and I've written about this before, when you die, the net will never know it. Your email, in all of your accounts, will just pile up forever. Your comment history will live on, but no one will ever care that you are no longer posting. It's rather like we're social zombies and when we notice that Bob no longer writes comments, we just shrug our collective zombie shoulders and shuffle on.
What an empty place the web really is.