The Agence France-Presse news agency has banned its journalists from using Wikipedia and Facebook as sources in news stories. This comes after it was caught with its pants down quoting liberally from a fake Facebook profile setup in the name of Bilawal Bhutto Zardari, the son of slain former Pakistani Prime Minister Benazir Bhutto.

On one hand, many non-journalists might argue that it’s obvious such user-generated sites should not be considered authoritative.

But this story exposes one of journalism’s Achilles heels: In general, we take people at their word that they are who they say they are. Unless there is something suspicious that would lead us to believe otherwise (like someone giving their name as Hugh Jass), we ask people for their names and we trust that they’re not fooling us.

Is this wrong? No matter how good we get at our jobs, journalists will always be vulnerable to pranksters and others who intentionally try to mislead us. (Insert Iraq war comparison here.)

Should we just accept that as an occupational hazard, or should we start checking ID whenever we want to quote someone by name?