Facebook uses a fan-out-on-read approach http://www.quora.com/Facebook-Engineering/Did-Facebook-develop-a-custom-in-memory-database-to-manage-its-News-Feeds ht

Facebook uses a fan-out-on-read approach http://www.quora.com/Facebook-Engineering/Did-Facebook-develop-a-custom-in-memory-database-to-manage-its-News-Feeds http://www.quora.com/Facebook-Engineering/Did-Facebook-devel...