>> it can take up to 5 minutes for a tweet to flow from Lady Gaga’s fingers to her 31 million followers Why not break the load up among a farm of servers? 5 mi

>> it can take up to 5 minutes for a tweet to flow from Lady Gaga’s fingers to her 31 million followers Why not break the load up among a farm of servers? 5 minutes to deliver a single message? It's too bad multicast can't be made to work for this use case. At least analyze to see if there's a pattern of geographic concentration of her followers and optimize for where their datacenters are. Use peer to peer, let the clients help distribute the messages.