Some of those companies are using Oracle for certain apps: Oracle at Facebook: http://venturebeat.com/2010/12/08/tim-campos-dreamforce-comments/ http://venture

Some of those companies are using Oracle for certain apps: Oracle at Facebook: http://venturebeat.com/2010/12/08/tim-campos-dreamforce-comments/ http://venturebeat.com/2010/12/08/tim-campos-dreamforce-comm... Correct me if I'm wrong, Amazon (the retail online store) was using Oracle in the past. I don't know what DB they're using now. Ditto with eBay.