Who likes it?

Hello, all. I have Facebook like and share buttons on my site, but I can’t see who it is that liked it. For example, my latest post says 20 people like it but I can’t see who they are. Is this normal, or is there something I neglected to do?

https://www.alanpickersgill.ca/the-picture-on-the-wall/

Thanks in advance,

Alan Pickersgill