Originally Posted by Princess Ellisa

If I were to hazard a guess... I would say that it is largely do to the fact that most of the time you add someone to your ICQ because whatever you are doing in that moment requires you to talk them.

Most often it is somewhere between an hour and 7 days before that person actually ads you.

Usually by then something else all important is consuming your time so until you get back to whatever it was you were doing when you looked for this new addition do you remember to say hello.

Maybe not totally the best etiquette... but such is the world of Internet.