Fortune 100 companies don’t quite know what to do with Twitter, according to a new report.  Public relations firm Weber Shandwick instead painted a picture of big corporations just staking out their territory and then occasionally issuing the 140-character equivalents of press releases.

ÜBERCEO is sharing the results of some research, indicating that social media is not much of a priority among Fortune 100 CEOs. In fact, it’s barely existent within their own practices.

Most of these CEOs are not twittering. They’re not on Facebook, or even on LinkedIn – the social network, which caters specifically to professional relationships. The study looked at Fortune’s 2009 list of the top 100 CEOs to determine how many were using Facebook, Twitter, LinkedIn, Wikipedia, or had a blog.