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You can chat for free with many thousands of other people - you will always find nice people in our many chat rooms.Or do you want to create your own chat room for you and your friends? Also, you can take part in our huge discussion board.Unlike a three-guys-in-a-garage startup, we don't have the luxury of scaling out infrastructure to keep pace with user growth; when your feature's userbase will go from 0 to 70 million practically overnight, scalability has to be baked in from the start.
The naive implementation of sending a notification to all friends whenever a user comes online or goes offline has a worst case cost of O(average friendlist size * peak users * churn rate) messages/second, where churn rate is the frequency with which users come online and go offline, in events/second.
Another challenge is ensuring the timely delivery of the messages themselves.