Yesterday I tried to use/signup for ZohoWiki, trying to find a good documentation / CMS for team collaboration. I decided to signup using Facebook. I clicked the FB icon over there and I was redirected to Facebook.
In then Facebook asked me to grant the ZohoWiki app permissions to do nasty things on my behalf if it deemed. I chose not to share my email address with it so I Un-Checked the email-checkbox. When I submitted the form the ZohoWiki continuously yelled at me for not giving access to my email address.
Now the solution is to remove the ZohoWiki app from Facebook and re-Signup