title: Can't link facebook to user with parse.com
body: <p>Hi so I set up the facebook sdk and followed all the steps in the parse.com documentation. (<a href="https://www.parse.com/docs/ios_guide#fbusers/iOS" rel="nofollow">https://www.parse.com/docs/ios_guide#fbusers/iOS</a>), and when I run the app in my simulator the link opens up in the safari browser and allows me to link the user to their facebook. However, when I put the app on my phone and try to connect the user to their facebook nothing happens. I have checked and permitted access to the facebook app, but it still doesn't work. Has anyone else had this issue? and has there been any solutions? </p>