OK, so get out Wireshark and have a peek for yourself. Figure out how to decode the data in the responses returned from the server (I'm sure it's not much more than maybe binary packages of metadata transmitted over SSL) and examine it until you're confident.
http://ask.wireshark.org/questions/16788/wireshark-decrypt-s... http://computer-forensics.sans.org/blog/2009/03/10/pulling-b... should help get you started.
"The great thing about facts is that they're true whether you believe them or not"
Also, Notch has "confirmed" this (if you trust him more than a sketchy anon source that RockPaperShotgun has stated that they've verified) https://twitter.com/notch/status/311535572596432896