Measure the right thing.
- People ask about how many IMs do you deliver or how many active users. Turns out not to be the right engineering question.
- Hard part of IM is how to show correct present to all connected users because growth is non-linear: ConnectedUsers * BuddyListSize * OnlineStateChanges
- A linear user grown can mean a very non-linear server growth which requires serving many billions of presence packets per day.
- Have a large number friends and presence explodes. The number IMs not that
big of deal.
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