I think I’ve seen it on these boards, but many other places too.
At first I thought it was a typo. But I’ve seen it so many times, I don’t know anymore.
Multiple commas, almost like ellipses points with periods, but with commas thus: ,
Now you do realize that this is grammatically incorrect, if people are using it for any reason.
EDIT: This message board won’t let me display multiple commas for some reason. But you know what I mean .