One year, and their machine is growing and growing. From two servers and now 20 servers. That’s some progress huh? Ofcourse you need all that, because of 623,293,056 request per day made by all wordpress account around the net. Check it out about their 20 servers:

“Gravatar now lives on about 20 servers. 2 Database servers, 1 File server, 2 Load balancers, 5 Caching servers, 9 Web servers, and 1 Development server. That combination of servers is handling an average of 7,214 of your requests every second of every day. That’s a whopping 623,293,056 requests daily!”

And also, check it out about the technical details on gravatar.

via ma.tt