CEOs have come around on social media, but most still aren’t engaging with audiences online, according to a March report released by Weber Shandwick that gauged the sociability and online engagement of U.S. executives.

Weber Shandwick's “Socializing Your CEO” report found that the vast majority of U.S. public company CEOs and private company CEOs — 92 percent and 76 percent, respectively — now maintain some form of online presence, be it on social media or their company’s website.

Engagement among these executives remains low, however, with just 22 percent of public company CEOs and 34 percent of private company CEOs interacting with audiences online in the past year.

The report also found that fewer than four in 10 public and private company CEOs (38 percent) have posted online within the past year.

The report defined engagement as any correspondence between a CEO and site visitor, be it participating in a discussion or responding to comments or criticisms on Facebook or any other online forum, including corporate websites.

Socializing Your CEO IV: The Engagement Factor

The report discovered that public and private company CEOs exhibit different online behaviors. For example, although private company CEOs are the least likely to be visible on their company’s website (66 percent, vs. 90 percent for public company CEOs), they’re more likely than public company CEOs to be found on social networks (59 percent vs. 50 percent, respectively). Public company CEOs are also more likely to engage with audiences when they do post online.

The study also found that Silicon Valley CEOs are uniquely more likely to engage with audiences than chief executives from other industries, at 39 percent, and also exhibit a slightly higher posting rate (41 percent). On the other hand, Silicon Valley CEOs revealed slightly less overall online social presence than public company CEOs, at 86 percent vs. 92 percent.

Weber Shandwick’s “Socializing Your CEO” study, the fourth installment in a series that began in 2010, analyzed the online presence of CEOs from the top 50 public U.S. companies listed in the 2016 Fortune 500 rankings, as well as CEOs from Fortune’s 25 Most Important Private Companies in the U.S. and Mercury News’ top 150 companies in Silicon Valley for 2016.

CEOs were gauged on public presence and visibility, as well as posts and engagement activity during the last 12 months across several online platforms, including company websites and YouTube, and external CEO blogs and websites, as well as Facebook, Twitter, LinkedIn, Google+ and Instagram.