Nobody knows; that's exactly what was so bad about it. For me, Ping was a sidebar in iTunes that I could click on bands I liked. It was basically the 'Like' button in Facebook, without... the rest of Facebook. Unless I'm missing a *whole* lot, I fail to see how that even falls under the definition of 'social network'.
Yeah, I felt like Ping was just trying to sell me overpriced and low-quality iTunes songs, so I disabled it in Parental Controls. Thank goodness for paranoid parents who make those options necessary