Something I've been seeing a bit more recently is people have a habit of responding to people, without quoting them. Example.:
Person A)
Person B)
Person A)
Have I just been sheltered all my life and never experienced this before until now?
Person A)
I disagree because the Earth is Flat.
Person B)
That's wrong because...
Person A)
Well I'm right because I get the last word in and I have't quoted you, so you don't get the response notification.
Have I just been sheltered all my life and never experienced this before until now?