At the end of the last week, Apple announced Ping Social networking service has hit 1 million users since its launch 48 hours ago.

According to the official data unveiled by the company, over 30% of the people who have downloaded iTunes 10 have joined Ping. That’s why. Apple is expecting the Ping community to continue growing in the coming weeks as growing amount of people is being attracted by the new service.

However, Ping Social has a number of interesting limitations to overcome. Anyone who tried out the service since launch will know that unless you’re a Lady Gaga or Yo-Yo Ma fan most of your favorite artists have yet to establish a profile. This is likely because of the veil of secrecy maintained around all Apple products, but they would have been far better off risking an information leak than unveiling a service that many will try once, get frustrated with and never return to.