My posting voice on HN is very different than my professional voice, and I don't want the two spheres connected at all.
(Similarly I don't want my reddit or tumblr accounts connected with my professional space, but I do want my github and linkedin accounts connected with my professional space, and I try to keep my facebook account generally respectable; these days it's mostly shares of 'Old Friends Senior Dog Sanctuary' pictures and if any employer doesn't like that they I don't want to work for them).
(Similarly I don't want my reddit or tumblr accounts connected with my professional space, but I do want my github and linkedin accounts connected with my professional space, and I try to keep my facebook account generally respectable; these days it's mostly shares of 'Old Friends Senior Dog Sanctuary' pictures and if any employer doesn't like that they I don't want to work for them).