title: when to properly store or delete users device token
body: <p>Okay so im coding this app in iOS. Got the Push Notifications down pretty good. I just have one question. Would it be wise of me to store a users device token when they login and delete it when they logout, or keep it forever and basically only update it when a user logs in. </p>
  
  <p>I guess what im seeking is.. best practices for storing and renewing device tokens.</p>
  
  <p>My main issue is this.. when a user logs out... dont they expect to no longer receieve push notifictions. How does facebook approach this? From my understanding if i log out of my FB account through the FB app. It no longer sends me Notifications, am i correct? Im not a big FB user lol</p>