This is a chat room.
The tube is a message bus. When a sender pushes a message into it, it just comes out on the other side, and everyone receives it.
![]( "chatroom")
The tube is a message bus. When a sender pushes a message into it, it just comes out on the other side, and everyone receives it.
This is e-mail.
We’ve added a valve on the sender’s side. It lets the sender control to whom the message goes out. On the receiving side there’s nothing, you can get messages from everyone – look into your spam folder for proof.
![]( "email")
We’ve added a valve on the sender’s side. It lets the sender control to whom the message goes out. On the receiving side there’s nothing, you can get messages from everyone – look into your spam folder for proof.
This is Twitter.
Now there’s a valve on the receiver’s side. Everything you publish is public, but you only get messages from senders you follow.
![]( "Twitter")
Now there’s a valve on the receiver’s side. Everything you publish is public, but you only get messages from senders you follow.
This is Facebook.
The two valves on both sides are interlocked. Opening them to someone enables sending and receiving messages.
![]( "Facebook")
The two valves on both sides are interlocked. Opening them to someone enables sending and receiving messages.
This is Google+ Circles.
The valves are independent. The red valve controls the receivers of message; this is the circle a message is published to. The green valve is a circle of of the recipient. The message only gets through if the sender is also in the receiver’s circles.
![]( "Circles")
The valves are independent. The red valve controls the receivers of message; this is the circle a message is published to. The green valve is a circle of of the recipient. The message only gets through if the sender is also in the receiver’s circles.
