Unnamed sources are claiming that Facebook is currently blocking Apple's Ping service because it violates Facebook's terms of service. Because of this, Apple has apparently delayed Ping's Facebook Connect feature.
According to reports, Facebook originally denied Apple's new social network access to application programming interfaces (API) that allowed Ping to hunt down an iTunes user's Facebook friend who had also signed up for Ping. Typically the API is open and doesn't require permission unless a 3rd party needs to access Facebook excessively.
Because of Ping's excessive requirement, Facebook and Apple went into negotiations. Apparently the two could not reach an agreement, leading Facebook to suggest that Ping users could add friends by performing a search or send an email.
Steve Jobs reportedly described Facebook's demands as "onerous terms," however the Facebook Connect feature remained in place during Wednesday's presentation and after iTunes 10 became available. Sources claim that Apple went ahead and accessed the Facebook API freely anyway, however Facebook eventually blocked Ping, leading Apple to temporarily discontinue the Facebook Connect feature.
Both parties are said to be back into negotiations, possibly to incorporate a more "robust" Facebook Connect feature later in the future.
"Facebook believes in connecting people with their interests and we’ve partnered with innovative developers around the world who share this vision," Facebook said in a statement. "Facebook and Apple have cooperated successfully in the past to offer people great social experiences and we look forward to doing so in the future."