I am developing iphone app which shares photos on social networks.For photo sharing I am using \"Sharekit\".I have created Facebook App and using its api key and secrete.(us
apparently this problem was faced by me too.
Since i was using their old API methods.. it is really tough to find the cause now..
Although i have not used ShareKit..i believe it is also using the older methods.
I solved the problem by using their official tutorial on Facebook iOS integration
I noticed that the version of sharekit i am using 0.2.1 is pretty outdated one. The project was moved to github and the latest version 2.0 can be found here. The home site is outdated with version 0.2.1 so follow the github link for latest update.
You might want to take a look at Socialize: http://www.GetSocialize.com, which uses the newer methods. Full feature list at http://go.GetSocialize.com/features
Good luck!
DROdio