So Apple is dancing around, boasting of one million users having joined Ping in under 48 hours. That’s a pretty funky dance, Apple. “One-third of the people who have downloaded iTunes 10 have joined Ping,“ says Eddy Cue, vice president of Internet Services. “As many more people download iTunes 10 in the coming weeks, we expect the Ping community to continue growing.” Alright, Ed. Granted, that sounds impressive. But consider the following: Spider-Man 3 is one of the top-grossing movies of all time. It is also universally hailed as one of the worst movies of all time. The perceived popularity…