Hello.
I would like to suggest it as default rules (add new user points):

Add award for users that share content (if this conted get any reaction).

If user1 likes user2's video (photo, stream post or other stuff) I suggest user2 (author) get user points. So he can get "reward".

At the moment ES has similar User Points:

Like Your Reply Discussion in Page
Earn points when someone likes your reply for a discussion inside page

It will makes user add more content and social more active.

Thanks.