To start with the @ was used in twitter as a kind of checkin, to say where you are. The very first was by Ev, checking in to herbivore to tell us he’s getting a breakfst burrito. Twitter was only 4 days old when this convention started.
Anarchogeek explica cómo inventaron el famoso @Reply de twitter. No es gran asunto, pero ideal para la conversación borracha post 4Am de este fin de semana.