An old version of a similar page used the query (with a bit of JQuery around it)
Although that still works, I suspect it will be deprecated. The latest version
So my work around was to create a list with the same name as the user I wanted to display on our corporate twitter account, add that twitter user to it, and use
http://api.twitter.com/1/user/lists/...instead. It doesn't require authentication, so works fine!