Every day, it seems like half a dozen friends or so can't help but hit the "Reply All" button after someones sent them a mass mailing.
It goes like this:
Person "A" sends out a brief, "Hi! Doing great! Finally figured out NING! Love you!", and sends it to me, to you, to that guy over there, and to about 157 others.
Then, at least 6 of those 159 people other than me go and hit reply all, and send out a simple "Love you, too!" to me, to you, to that guy over there, back to Person "A", and to about 157 others.
I can only speak for myself, but I really don't need all that spam. If you want to announce some great new thing, I'd love to hear it. Or, if you want to send me some personal note--great! But I know that *I* don't need to be on some "Send All" greet-the-morning-sun list. It's no different to me than finding another flyer for a great deal on a chicken parmigiana hero at the local Pizza shop tucked under the windshield wiper of my car..