iTunes updates and Ping I'm not very savvy.  I usually accept all iTunes updates to get any important fixes.  But I don't think I need Ping - never signed up and don't use social networking.
Should I reject iTunes update # 10 and its follow-ups, i.e., 10.3?
You don't need to use the Ping feature if you don't want to. You can still update iTunes. After updating, just click the icon at the bottom-right of the iTunes window to hide the Ping sidebar and de-select the Ping checkbox in the General tab of iTunes' preferences window.