Hi, I installed a calendar app called Sunrise. It asked me to sign up for Facebook, Google or Email. I recall that some apps do the same thing. What is the reason? Is it for some kind of events integration? Which is a better one to pick? Android users have a gmail account to sign in google store. That account receives email of all the events notifications. My gmail account is now full of junks like that. Is it advisable to create a new email account for apps that require signing in?