Algorithm for selecting content preferences based on likes?

Question

Machine learning

Algorithm for selecting content preferences based on likes? Posts are just from the text, some user likes, how can he give out the supposed ones that he will like based on those already liked?
I think it’s not necessary to think especially about the meaning just to count how many words are enough.
How difficult it is to tie the neural network to this, in fact, it will have to constantly learn with each new like with each new post added, and in addition to this, for each user, either its own network, or take it into account as a variable.