1) Comments that people actually use (I have a Disqus on my blog, but no one uses it)
2) Related: validation of feeling like maybe there's a glimmer of a chance that someone read something I wrote
3) Community - getting to see who else is writing what w/o having to read a bazillion blogs (although that'd be the same if I just lurked & commented)
4) SEO -- it seems to help to cross-post here.
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