MEAN GIRLS. Professor Reynolds and his acolytes are in full splutter over somebody who writes about blogs in the Toronto Star. One should think they'd be grateful that anyone bothers to write about our little hobby -- which probably ranks in share-of-cultural-consciousness somewhere between spray-on hair and Ultimate Frisbee -- yet they snarl at columnist Antonia Zurbisias like dissed teenagers, both at Fort Insta ("Fat, drunk, and Canadian," "fool," etc) and in