How to implement twitter, email, tumblr with ShareKit

I want share images to twitter, tumbler & Email with use of ShareKit, but i am not able to do that. For twitter uses the code..

 SHKItem *item;
 item = [SHKItem image:[UIImage imageNamed:@"icon2.png"] title:@"Praveen"];
 [SHKTwitter shareItem:item];

But i just see a blank screen. even uses SHKTwitterConsumerKey, SHKTwitterSecret, 开发者_高级运维SHKTwitterCallbackUrl, SHKTwitterUsername

but result is blank screen

you must keep the SHKTwitterUsername Empty , and set The SHKTwitterCalBackUrl same value as the value set in the app configuration in twitter side . and don't forget to set to 0 the SHKTwitterUsexauth .