Does the official Google Plus Android client use HTTPS for automatic photo upload? I'm at a conference using their (open) wifi.  Normally I don't bother to tunnel my connection because I figure anything I care about (email, banking, etc.) goes over SSL/HTTPS anyway.  It occurred to me, though, that my Plus client is set to automatically upload all my photos anytime it finds wifi.  Are those photos going "in the clear"?
I have verified that Google+ version 2.4.1.271037 on Android 4.0.3 uses HTTPS for instant upload. 

I did what @shambleh suggested and performed a network trace at my Internet gateway. Enabled instant upload, snapped a picture, and saw a bunch of traffic hitting Google servers (IP address 74.125.226.70, but remember this may change) on HTTP port 443. Using Wireshark, it's clear that the traffic is encrypted.