Do you have a Google+ page? If you answer is NO; and if you’re a startup and you are sending an email to your customers or your business partners, you re-think it.
Gmail is most used email service and for “Growth Hacking” effect you need to do create a Google+ page.
e-Mail’de
#Gmail açık lider. Google+ sayfasına sahip olmanın bir#GrowthHacking effect olduğunu biliyor muydunuz?
e-Mail'de #Gmail açık lider.
Google+ sayfasına sahip olmanın bir #GrowthHacking effect olduğunu biliyor muydunuz? pic.twitter.com/azkQIChmLa— Volkan Yılmaz (@wolkanca) June 17, 2016
https://litmus.com/blog/top-10-most-popular-email-clients-of-2015

https://www.linkedin.com/pulse/gmail-growth-hacking-volkan-yılmaz