How to create a face like?

Question

Counts

Hey!

Situation:
There is a user, there is a post that the user can create, and there are comments that the post can have. it turns out 3 collections: users, posts, comments

Question:
how to organize likes?

Assumption (2 options that I see):
1. Perhaps you need to create 1 collection of faces (likes) and associate with documents:
like user:
{ _from: 'user/123', _to: 'user/456' }
like post:
{ _from: 'user/123', _to: 'post/789' }
like comment:
{ _from: 'user/123', _to: 'comment/654' }

2. Create a collection of faces for each entity (userlikes, postlikes, commentlikes

) how to do it correctly in order to speed up the calculation as much as possible:
a) how many likes the post has and who put them
b) to whom / what the user liked

I'm just starting to understand arangodb, so don't scold me for stupid questions. I read the Doc, but there are so many options and which one would be best is hard to understand.