1. It greatly increases the traffic on the internet.
If you mean more connections that is true, but if you make a calculation
you will find that the increased traffic is nill and nothing compared with
the
traffic caused by spammers, viruses not to mention radio listners and
video viewers. Compared with this traffic the traffic argument is not really
a big thing. Historically the argument is valid but it is getting less and
less
interesting.
Additional traffic is not the only problem. What was a single
e-mail message is now a message body that has to be stored somewhere
reliable, plus a notification to the recipients that they can come
pick up their e-mail at such-and-such location. What was a single
e-mail message now has two parts, which increases by an order of
magnitude (or more) the problems with things breaking down and
getting disconnected or mis-directed.