On the official LibraryThing "ideas" blog, Thingology, LibraryThing goes to the mattress and attacks Shelfari: "We respect our competitors with one exception: the site 'Shelfari.com.'" Then they go on to explain why.
I suppose we could have used the title 'not safe for anyone' many times already, but I thought it would be especially pertinent here because in this show Richard and Hans illustrate the many situations in which the C-word is perfectly appropriate.