The difference between a news feed and an inbox

Over the recent months, I've seen much confusion between the "news feed" and an "inbox".

I would like to write this down for everyone to prevent confusion in some cases.

The "news feed" aka "the wall" is supposed to relay information that might be useful but is not obligating.
Ignoring it or missing it shouldn't come with a punishment.
You can't show items that require actions on a newsfeed.

An inbox can show actionable items like "Contract with Siemens is about to expire according to sourcing-software".
The reason that an inbox can show this type, and a news feed can't, is that it has a read/unread/deleted status to each item.
These different statuses make the items manageable and insure that everything you receive is still there until you handle it.
That’s also exactly why news feeds are so convenient for non-obliging information.