应用程序到用户和用户到用户的通知已被删除。相反，您应该使用计数器，新闻（在仪表板中）或发送电子邮件（给已授予该权限的用户），并查看我们的新通信渠道的***做法。

http://wiki.developers.facebook.com/index.php/Roadmap_Notifications

I think that this question already questioned, and probably the answer is here: http://wiki.developers.facebook.com/index.php/Notifications.send

but the real problem is that facebook says: Facebook discontinued support for this method March 1, 2010. Calling this method returns error code 3 -- Unknown method.

while, I couldn't find any other JS-api for the invitation, anyone know how we can invite users, using the JS api or the .net api?

thanks.

Application-to-user and user-to-user notifications have been removed. Instead you should use counters, news (in the dashboards), or send email (to users who have granted that permission), and check out our best practices for the new communication channels.

http://wiki.developers.facebook.com/index.php/Roadmap_Notifications