An embarrassing moment, today, for Michael Arrington, at the >play digital media conference at Berkeley, when he called up a web page of comments deriding the panel he was moderating. Arrington, the Techcrunch publisher, was leading a discussion on UGC, or user-generated content, the thing that used to be called blogging, until people discovered that UGC sounded more impressive to venture capitalists and corp development morons. One of the panelists: Evan Williams, maker of Blogger and now Twitter, a new blogging system which sends short posts to web pages, mobile devices and chat windows. Feeling guilty, presumably, that he'd talked over the shy Twitter founder, Arrington pulls up on the projector screen Evan's Twitter page, which shows comments by his friends. Among them, one from Stewart Butterfield of Flickr, the photosharing system he sold to Yahoo. Stewart: Every time I hear "UGC", a little part of me — and everything I've ever believed in — dies. Snarky comments from the audience, enlivening a mind-numbing panel: that's what user-generated content is all about. For the Twitter screenshot: