When you submit this form, you'll be taken to a Google
authorization page to grant our verification app temporary access to
see your G+ identity and email address. We'll use that to contact
you privately (if necessary) and to make sure we add the right
G+ account to the G+ communities/Slack/etc. We won't publish
the connection between your G+ identity and in-game identity; it's
up to you whether you want to do that.
If your browser isn't currently logged into your Google account
you'll first be prompted to log in. If you're using a separate
Google account for your Ingress identity, be sure to pick that one
when asked.