Hi, why when I share my homepage Facebook, Whatsapp, etc. shows thumbnails of original layout images that I don’t use?
Please try this plugin that might help.
You can also use this which is really helpful! https://developers.facebook.com/tools/debug/
Sorry but that plugin do not works.
It don’t allow to set a different image than the default item.
Alternatively you can use the WordPress SEO by YOAST to fix it. Please read on this article that tells the walkthrough.
Yes, I know. This is for set thumbnails of each article, but my problem is when I share the home page.
From Facebook’s debugger tool, it appears your homepage’s open graph image is http://www.economiaspiegatafacile.it/wp-content/uploads/2016/11/pp-1.jpg.
Could you try to overwrite it with other image (with the same file name) from FTP or cPanel?