NEW YORK: Seventy-nine percent of Fortune Global 100 companies are using at least one of four popular social media platforms, with Twitter leading Facebook, YouTube, and corporate blogs.

The study from Burson-Marsteller, called The Global Social Media Check-up, found that 65% of Fortune Global 100 companies had active accounts on Twitter. That was followed by 54% with a Facebook fan page, 50% a YouTube channel, and 33% a corporate blog.

However, only 20% of international companies were utilizing all four platforms ...