Apple has launched a social network as part of the latest version of its iTunes software.
Ping, as it is known, allows users to build networks of friends and professional musicians, in a similar way to services such as Twitter.
The service also builds playlists based on what friends are listening to.
Analysts said it represents a challenge to existing music-based social networks such as MySpace.
“It’s a social network all about music,” said Mr Jobs, launching the application at an event in San Francisco.
“We think this will be really popular very fast because 160 million people can switch it on today,” he said.