I have Google Alerts (a custom search) set up to alert me via RSS in Google Reader if my name, ip, email, etc show up online anywhere,
It must have done a search and alerted me while I was logged in at WDC.
For sure, my privacy options are set to NO ONE.
I signed into WD Community (WDC) with Chromium.
I open Firefox (same computer) where I am not signed into WDC or Google and go to my WDC profile page and there is no IP or email shown.
If I open another tab in Chromium, and go to my profile page, I see my email and IP.
When I view my profile page on my phone on 3g, (which is a different network) while I’m logged in at my computer, there is no ip or email shown.
That all seems correct, as there seems to be no security issue.
But, how Google was able to alert me is beyond my knowledge.