As in almost everything he does, Larry Ellison, the co-founder and CEO of Oracle, has been enigmatic in his use of social media. About 28,000 people follow his Twitter account. He follows no one and has tweeted only once. However, that tweet was long in coming and highly anticipated, so it made a big impact. We would not recommend this strategy for, well, for anyone, but it seems to be working for Ellison. Meanwhile, Oracle has been buying up social software companies, most recently including Involver.