I searched and searched and did not found answers.
I build a website with a certain name. After that, I created an app on Facebook. I connected my website with this app and everytime someone liked something, the app took metadata from my website. No prob. But I was not satisfied with the domain I used. So I changed the name of my website and then changed the app parameters. After that when people liked or recommended my a page, facebook kept showing the same metadata (description). For 99,99999999% I'm certain that the shown metadata is not on my server or in any map on my website. I believe it's "floating" somewhere on the servers of Facebook. What can I do?
Linting your url should clear Facebook's cache. At least that's what their documentation says.