2020-12-17 UTC
# 
[tantek] Ping was also known as <dfn>[[iTunes]] Ping</dfn>, a social network [[silo]] and recommender system operated by [[Apple]] launched 2010-09-01 and shut down on 2012-09-30 due to various problems, including [[spam]], and [[Facebook]] blocking access to its API. See https://en.wikipedia.org/wiki/ITunes_Ping for more.