I've an app where people can share photos, follow each other, chat etc etc but everything is chronologically ordered which I don't like.

I wanna create a relevancy model, not as complicated as Facebook ( they use 100000 factors and I barely have 10000 users 😅)

What I wanna is the more user interact with any user let's say ELLEN, the more a user interacts on ELLEN's account the more score will increase of Ellen in respect to the users.

If user likes Ellen score is increased more as compared to when he searches her or tags her on her post.

Is this just a formula which takes a lot of factors? I know quering for me is easy(if the score for this uset is > some number then show it first)

I'm not even aware about the terms used here I got the term relevancy model by a blog post. What kinda technologies do I have to use to achieve this and how do I do it.