Facebook Creating Custom Open Graph Stories on web

For my website I want to create Open Graph Stories, and I do not know much about built in actions and objects.

I want to create stories for following events done by my website users.

1. when my website user follow other user profile(these are not fb profiles).


2. when my website user likes an image on my website.


3. when my website user comments on a post at my website.


4. when my website user likes other user profile(these are not fb profiles).

What I want to know is which built in actions and objects I need to use. If i need to create custom then what will be their names? Thanks.