Redis Many Subscribe

After reading many articles , I decide to user socketio + node + Redis . I need to create node js server to handle many request

now , think I have facebook like site

every user connect to an Node JS server ( randomly ) and he will subscribe to his user id like here

client.subscribe('<the user id of person who user this'> );

And another user many publish a message to him easily .

client2.publish("<user id of receiver>" , "the is a notifcation");

Now a client from node 5 ( as example ) can receive notification of user of node 21 ( as example)

it seem that there is no problem , but wait , think we get 100 million user , so 100 million subscriber we have , if a person send notification to specific user , another subscriber should check if that is they own message ( redis do this automatically )

Do you think Redis can handle this problem , Even I have not tested this scenario in real world , as I have not found 100 million user yet!

As I am very new to redis , Please Redis,Node Expert help me of this scenario ...