The most important feature

The most useful features of any modern communication apparatus are, quite definitely:
a) the "off" button,
b) the "invisible" mode
because the communication thing is a bit obvious :p,
but it's nice to keep it restricted to people we really want to communicate with, and when we want to communicate.

Frankly, I fail to understand the need to be available to the world at any time of day and night, yet it seems essential for some people.
Hey, relax, you are not that important. The internet and Facebook, and Hi5, MSN, Twitter and all the websites will still be there tomorrow. And please don't try to convince me that all the 658639 people you have listed as "friends" will even notice you're missing.

Goodnight.
Over & Out.