Send notification to a particular User List using Node socket.io

Question

I am using NodeJS,Scoket.io

I am trying to send notifications like Facebook. If there are 1000 Users and User A have 50 friends then Notification is send to those 50 Users. I do not want to broadcast for all Users

What is the efficient way to do this ?

Answer 1

If a user has lots of friends then you can have all of those friends listening to a namespace or room for that user.

The explanation and example is here: http://socket.io/docs/rooms-and-namespaces/