- (void) setFacebookTokenFromPrefs
{
    if ([self rememberFacebookTokenOn] == YES)
    {
        NSLog(@"remeber fb token");
        facebook.accessToken = [facebookPrefs valueForKey:FACEBOOK_ACCESS_TOKEN_KEY];
        facebook.expirationDate = [facebookPrefs valueForKey:FACEBOOK_ACCESS_TOKEN_EXP_DATE_KEY];
    }
    else
    {
        [facebook logout:nil];
        facebook.accessToken = nil;
        facebook.expirationDate = nil;
        NSLog(@"don't remeber fb token: %@", facebook.accessToken);
    }
}