Apple on Friday said its new Ping service topped 1 million users after being available for only 48 hours. Eddy Cue, Apple’s vice president of Internet Services, said that one-third of the people that downloaded iTunes 10 have joined Ping.

Ping is Apple’s social networking service that is focused on music. It allows users to follow each other, recommend music, and follow artists. The service was announced during Apple’s annual music event on Wednesday.

You can join Ping by downloading iTunes 10 and activating the service.