I feel like when someone in a heated argument turns to me and says "You agree with me right?" What they are really asking is "Am I going to have to yell at you like this dumbass over here?"
I don't leave voicemails because I know they aren't listened to. Yet, if someone calls me and doesn't leave one, my first thought is that it wasn't important enough for me to call them back.
If Facebook ever shut down, you'd see people aimlessly walking round streets, scribbling on walls, poking each other, searching for their friends, thumbs-upping and commenting at everything they see and tagging one another.