Blanck facebook feed dialog box titanium android

I'm trying to send a post to a selected facebook friend wall using the facebook feed API (as the graph API now only works in iphone for me and this is the reason : and this is the code i wrote :

//facebook initialization :
facebook = require('facebook');
facebook.setBubbleParent(false);
facebook.appid = 'xxxXXmyappIdXXxxx';
facebook.permissions = ['publish_stream', 'read_stream', 'email','user_photos', 'friends_photos', ' user_events', 'friends_events','user_likes'];
facebook.forceDialogAuth = true;
 
 
var data = {
    link: 'xxxXXXX mylink XXXXXxxxxxx'+Alloy.Globals.invitation_code,
    name: L('fb_invite_wall_post_name'),
    message: L('fb_invite_wall_post_msg')+Alloy.Globals.invitation_code+"'",
    caption: L('fb_invite_wall_post_caption'),
    picture: "xxxXXXX picture Url XXXXXxxxxxxlogo_big.png",
    description: L('fb_invite_wall_post_descrpt')+Alloy.Globals.invitation_code+"'.",
    to:this.user_uid
};
    //facebook.requestWithGraphPath(this.user_uid+'/feed', data, 'POST', showRequestResult);
 
    facebook.dialog("feed", data, showRequestResult);

by the way , i don't know why displaying images here never worked for me, i tryed this :