Implement more general score algorithm

What are the requirements for the scoring algorithm:

Be like, repost, comment independent (can work on a platform where we don't have all those params). In the worst case we only have date, our group rating and our platform rating.
Be platform independent. The different platform has different user activity, so we need to normalize ratings over average ratings. For example, in VK we have a huge amount of likes added at the start and then meme get fewer likes. In opposite or Reddit meme has something like a normal distribution.

FedorZaytsev / FedorMemes