TVNewser has learned the CBS News blog PublicEye, once described as a “de facto ombudsman” of CBS News, has ceased operations. CBS Interactive cut several staff members last month, including Matthew Felling who was editor of the site.

A spokesperson for CBS Interactive tells TVNewser, “We weren’t able to find a sustainable business model for Public Eye. We are exploring ways to maintain a similar spirit of public discourse by engaging the CBSNews.com audience and building a community around multiple voices.”

Launched July 12, 2005, PublicEye stated its “fundamental mission” was “to bring transparency to the editorial operations of CBS News.”