What kind of algorithm used by facebook for friend suggestion?

Answer 1

Extremely advanced, machine learning. There are a few courses available on it in sololearn.

Answer 2

1. I believe that they see ur friends's friends and suggests you some of them.
2.In some photos of yours they use machine learning to identify different people and suggests you those users.
there is a hell lot of machine learning used that's for sure.

Answer 3

I guess there are many factors involved.
It probably takes all your informations, like where you live, who are your friends, what activities, in what are you interested and then just lists people whos informations have the most matches when compared to your informations.

Answer 4

The data is most likely stored in a database and user's activities (which get tracked) feed it with informations. Afaik the correlation between users is managed with a graph structure.
https://www.sololearn.com/learn/656/?ref=app

Answer 5

what kind of data structure they use to gather all the information?

Answer 6

If anyone wants to see real example of Machine Learning. See this.
https://teachablemachine.withgoogle.com/