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I agree that the complexity is bad if we are using graph.
- Stanand April 28, 2015We can use NoSql DB and create document structure like this:
For user:
User {
id = 11
friends_ids: {1, 2, 3, 4}
new_friends_ids: {5, 6}
}
For "like" we need create document for every object that can be liked:
Picture {
id = 14
liked_by_ids: {1,3,5}
}
In this case if you come to your friends page we just need to compare two lists "friends_ids" to know common friends.
To known who liked picture we just need get liked_by_ids list.
This approach can be extended to user comments also.
Scalability is reached by NoSql DB. We can use distributive DB.