A survey of CEOs of Fortune 100 companies by UberCEO, found that their involvement in social media is almost none existent. No CEOs blog and only two have a Twitter account.

"I didn't expect CEOs to be heavily involved in social media but I was very surprised to see how few there were," said Sharon Barclay, founder of Blue Trumpet Group, which publishes UberCEO.com. It's a San Francisco based firm that helps manage the online reputations for senior executives.

Here are some of her findings:

- Only two CEOs have Twitter accounts.

- 13 CEOs have LinkedIn profiles, and of those only three have more than 10 connections.

- 81% of CEOs don’t have a personal Facebook page.

-Three quarters of the CEOs have some kind of Wikipedia entry, but nearly a third of those have limited or outdated information.

- Not one Fortune 100 CEO has a blog.

- Twitter was the least used service by Fortune 100 CEOs, despite being one of the fastest growing social media networks.

- Wikipedia had the highest level of engagement among the Fortune 100 CEOs, yet 28% of those entries had incorrect titles, missing information or lacked sources.

- LinkedIn, a site mainly used for professional networking, only attracted 13 Fortune 100 CEOs, five of which had just one connection.

- Three CEOs stood out from the pack on LinkedIn, each having more than 80 connections. However, they are all from technology companies – Michael Dell (Dell), Gregory Spierkel (Ingram Micro) and John Chambers (Cisco).

Ms Barclays' interest in the subject was piqued recently when she was researching a senior executive at one of the largest US technology companies. Google results linked his name to a sexual offender. She was surprised that he hadn't taken steps to distance himself from his online namesake.

"A company's brand value is closely tied to its CEO and senior executives. Companies need to pay attention to managing their online reputations. Also, by snubbing social media, CEOs can appear to customers as being disengaged, disinterested, and disconnected. That's not a good message."

Ms Barclay says she will repeat her survey next year.

Here is a more data from the survey: