Chrome threw an SSL warning at me when I tried to login. This is the story of how it all went down.
I created an account on the Network Engineering Stack Exchange site. I created the account by logging in using a Google Account, and then I posted a question. I did this on an iOS device using Chrome.
I was browsing SO and saw a notification for +100 rep on Network Engineering, and clicked on it. It brought me to the page explaining reputation. I noticed I was not logged in, despite being logged into Stack Overflow with the same Google Account. I clicked the login link located in the black horizontal bar at the top of the page and was presented with the warning.
I understand why Chrome threw this warning at me, but I wasn't sure if this was the behavior intended by the Stack Exchange developers, or if they didn't know about it. Personally, I think this warning may scare less experienced users away, so I felt obligated to post about just in case no one knew about it yet.