Most PR pros know to use social media platforms to engage the public, but many are also finding ways to use them to communicate with colleagues and clients.

Al Comeaux, SVP of corporate communications at Sabre Holdings, a travel retailer and technology provider, helped his company build an enterprise social network, allowing his colleagues to share and distribute internal information behind a corporate firewall.

“We use [online community platform] Cubeless like Facebook, but with employee-only access,” he says. “While the ...