I am deeply involved in integrating Facebook from the social network site ESMZone.com. I initially started using the Grails facebook-connect plugin and had good success in integrating Facebook with the integration with the Grails jScurity plugin. However, when I tried to implement other functions, in particular invitations for friends, I found that the facebook-connect plugin uses the old facebook SDK, which is incompatible with the new Javascript SDK. Documentation and examples using this new SDK were easily searchable, unlike the old API.
I switched to the Grails facebook-graph plugin and was able to easily work with the Javascript API and receive friends' invitations.
Danomighty
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