Why does the sharing on social media feature not work?

Hi there. I installed the free version. If it works well, it will upgrade without a shadow of a doubt. But the sharing to social media doesn’t work. I asked some of my customers to test it for me. If they share to facebook and I click on the link, I only end up seeing my own ‘my account’ page. Even on a browser on which I am not logged in anywhere, I still don’t see her wish list. Am I missing something?
I understand that support is only for the pro version, but I cannot upgrade if I can’t get the free version to work. I hope you would be able to help me.
The plugin is currently disabled.