What are Facebook-visits registered under "Search Engines"

Hi everybody,
I worked with Matomo for quite some time now and today I encountered something interesting.
If I check the channel “Search Engines” under acquisitions, there is quite a large amount of visits that seems to be coming from Facebook - yet it is somehow registered under “Search Engines”.

I know the difference between Facebook-visits registered under “Campaigns” and “Social Networks” but this is new to me.

In what way exactly are people coming from Facebook to the landing page to be registered under “Search Engines”?

I’m interested in all answers and look forward to be using the forum in the future, this is my first post :slight_smile:

Best,
J

@innocraft, do you have an idea?

Confirming:

FB referrals are appearing in the
Acquisitions > SearchEngines panel?

Yes, thats whats happening:

It is in german but I think you get the idea. In the submenu (after pressing “+”) it just says “Query not defined”.