Is there a way to have a user post to a feed through a process model (like what

Please check the Post Event to Feed smart service at forum.appian.com/.../Post_Event_to_Feed_Smart_Service

Ah thanks, that page does contain the answer to my question:
"If the specified user is not included in the users and groups targeted by a message, this user can also view the posted event due to their association with the posting. "