Doodling is a decent word describing idleness, what does one do if there is nothing more important to do or has some time to wail away! In the past one just slept, watched TV, read or do petty tasks and attend to odds which get left out in the otherwise busy routine.
But with the city living and change in life styles it is far less expensive and convenient to seek entertainment and engagement on the internet. Social interaction may not be the aim always, the inherent human dumbness makes people to get fully engaged on social sites. The old timers and the uninitiated may call this addiction, but it is not. It is far more educative and informative, only if one knows and consciously engages in productive net surfing.
Multi-tasking is one thing which everyone must do to maximise and optimise the time and resources available in our immediate sphere of day-to-day living environment.