Hi,
Well, different events will requier different implementations.
For the add to cart, the cart.updated event can be used in your custom javascript code so that you can then run FB's javascript code to register the event:
www.hikashop.com/support/documentation/6...ocumentation.html#js
You'll probably want to add your js code in the product / show_default view file, via the menu Display>Views.
For the "view content", supposing that we're talking about view of a product details page, then it would be at the same place.
For the purchase, you can add your javascript in the checkout / after_end view file.
There is no one plugin already developed which can handle all that for you as far as I know.