We're creating a Chatter feed using our App by putting a trigger on an object but in some cases the feed is formatted as "<user A> to <user B>: <Message>" instead of just "user B>: <Message>.

User B is the owner of the object and we're posting the message into their Chatter feed.

User A is the authenticated user (through the API) that caused the trigger to execute.

Is there any way to avoid this?