"A new feature in Google Inc's Gmail will result in some users receiving messages from people with whom they have not shared their email addresses, raising concerns among some privacy advocates."
http://www.cbc.ca/news/technology/gmail-privacy-concerns-flagged-over-new-feature-1.2491370
Although anything can on line can be traceable or track-able, this doesn't seem like a good feature. People should always have the choice to determine how pubic or "private" their communications are.
http://lifehacker.com/how-to-encrypt-your-email-and-keep-your-conversations-p-1133495744
"Some privacy advocates said Google should have made the new feature "opt-in," meaning that users should explicitly agree to receive messages from other Google+ users, rather than being required to manually change the setting." http://www.cbc.ca/news/technology/gmail-privacy-concerns
The default setting should always be on the most private setting & then each user can determine if they want to have a wide open public setting. Sure, you can give out your email address, just like your phone number. It could become semi-public, but its not necessarily wide open as would be the case if it were on your website. http://email.about.com/od/staysecureandprivate
http://www.ghacks.net/2013/07/14/lavabit-is-probably-the-most-secure-private-email-service-right-now,
http://www.theguardian.com/technology/askjack/2013/aug/15/gmail-google-email-privacy,
http://www.kabissa.org/about/news/how-can-i-make-my-e-mail-private-and-secure
Some people like to have a less public phone number & an email address that isn't meant for everyone to know about. Again,at the highest level, everything remains intercept-able and traceable.
http://www.technologyreview.com/news/518056/why-e-mail-cant-be-completely-private,
http://www.pcworld.com/article/2046962/nsa-dodging-mail-service-explains-why-email-can-never-truly-be-private-and-secure.html
http://www.popsci.com/technology/article/2013-08/what-are-your-options-secure-email,
http://gizmodo.com/why-kolab-might-be-the-best-secure-email-service-still-1171618005
http://www.makeuseof.com/tag/3-secure-encrypted-email-providers-online,
https://www.hushmail.com
So much data goes over the mobile phone networks now.
http://en.wikipedia.org/wiki/Android_(operating_system),
http://bgr.com/2014/01/07/intel-android-windows-dual-os
http://en.wikipedia.org/wiki/IOS_(Apple)
http://en.wikipedia.org/wiki/Mobile_operating_system#Windows_Phone
http://www.zdnet.com/windows-and-android-on-one-pc-heres-how-amd-and-intel-plan-to-do-it-7000024942