Oracle CEO Larry Ellison

Ellison's Twitter account, from which he has only posted one tweet, already has 35,000 followers who hope to hear from the notoriously outspoken enterprise software chief.

When Hewlett Packard fired then-CEO Mark Hurd, Ellison was not pleased. "You are going to fire Mark Hurd and hire Leo? What I said at the time was that this was the best idea since the Apple board fired Steve Jobs. Really brilliant."

Ellison went on to hire Hurd himself. He's also accused SalesForce CEO Marc Benioff of stealing the idea for NetSuite from him.