Music biz microblogging can be sure silly, with its potential for overblown beefs and identity theft. But it's hard to get mad at @LilyRoseAllen's cryptic concert ticket hunts or @METALFACEDOOM reviewing the new Eminem video. Yesterday we were retweeted by half of Tears For Fears ... #swoon. There's vital discourse happening in the Twitterverse, if you know where to look ...