abs.apple.com resolves to 17.112.144.82, which appears to be part of an IP range owned by Apple. It's possible that the server is running third-party software, but it does appear to be hosted by Apple.

Yes, it's the db related to their anonymous surveys apparently. [1]

[1] http://tech.fortune.cnn.com/2011/07/04/hackers-target-apple-...

edit: I don't believe it's third-party however. But the important takeaway here is that this isn't related to Apple's iTunes accounts; rather it's a survey.