For every 10 user comments posted to ABCNews.com, two or three of them get banished from the site. They're too profane or too bigoted or just too much to bear, even by the wide-open standards of Internet conversation.
The job of tempering the discussion falls to people like Deirdre, a 41-year-old online moderator who asked that her last name be withheld to protect her privacy.
During an election season, for instance, the volume of comments escalates and, with it, the potential for incendiary speech, said Deirdre, who works for Mzinga, a Burlington, Mass.-based social media and community management firm.
Offensive posts often include nasty twists on the names of politicians and political parties, she said. Obambi and McSane are harmless enough, but Democrap and "Congoleeza Rice" for Secretary of State Condoleezza Rice are examples of name-calling that push the envelope too far.
As companies embrace social media and launch online forums that allow customers to share opinions about their products and services, they're realizing that simply creating Web sites is insufficient.
The savviest managers are paying close attention to what transpires on those sites as well, because they understand that user comments have the potential to influence other consumers and, sometimes, even investors.
Observing a shift in the pervasiveness of public commentary and conversation, Barry Libert, in 2001, launched a predecessor to Mzinga.
His founding thesis? "Become the party giver," he said. "Stop being the dance hall."
What makes a party memorable, the Mzinga board chairman said, isn't the location of the get-together. Instead, it's the food, music and, most of all, the people.
Similarly, a Web forum on its own isn't going to attract and retain users. The "hosts," or moderators, are the ones who have the power to ensure a positive online experience.
Mzinga's clientele include big name companies such as American Express, Cadbury Schweppes, The New York Times Digital and ABC. Its business has doubled in the past year.
Mike Pascucci, Mzinga's director of moderation services, said that 50 full-time and about 30 part-time moderators in the United States and overseas manage about 14,000 communities for Mzinga's dozens of clients.
Once a company decides to work with Mzinga, it creates a set of guidelines that will govern the online community. Larger clients tend to be more set in their ways, while smaller ones are more flexible and open in terms of the kinds of content that can be allowed, he said.
But as the sites evolve, so, too, do the rules and the roles of the moderators.
"Most companies are just educating themselves about what that role needs," Pascucci said.
When moderators are first assigned to a new client, they undergo preliminary training.
But the key to successful moderation is ongoing communication and guidance, he said. Moderators are consistently in touch with their clients as they learn to identify the line that separates the acceptable from the atrocious, he said.
For some clients, moderators seed content and interact with community members. For example, if new users are shy about submitting personal stories on a parenting site, the moderator will get the conversation started with stories of her own.