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CModule::IncludeModule('blog');
CModule::IncludeModule('socialnetwork');

$userFromID = 1;
$userTargetID = 488;
$blogTargetID = 34;

$arFields= array(
   'TITLE' => 'title '.mktime(1),
   'DETAIL_TEXT' => 'message '.mktime(1),
   'DETAIL_TEXT_TYPE' => 'text3',
   'DATE_PUBLISH' => '01.01.2016 00:00:01',
   'PUBLISH_STATUS' => 'P',
   'CATEGORY_ID' => '',
   'PATH' => '/company/personal/user/'.$userTargetID.'/blog/#post_id#/',
    'PERMS_POST' => Array(),
    'PERMS_COMMENT' => Array (),
   'SOCNET_RIGHTS' => Array( 'U'.$userTargetID, ),
   '=DATE_CREATE' => 'now()',
   'AUTHOR_ID' => $userFromID,
   'BLOG_ID' => $blogTargetID,
);
   
if( $newID = CBlogPost::Add($arFields) ){
   $arFields['ID'] = $newID;
   $arParamsNotify = Array(
      'bSoNet' => true,
      'UserID' => $userTargetID,
      'user_id' => $userTargetID,
      );
   var_dump(CBlogPost::Notify($arFields, array(), $arParamsNotify));
}