"commenter" is a pretty unusual word (much less common than "commentator"). However, "commentator" suggests a little more than "commenter". If someone merely makes a comment on a blog post, say, then that hardly makes them a "commentator".
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AvidlearnerI want to use the word 'commenter' for my blog posts in a social site.Use it in what way? What is the full context?
AvidlearnerI want to use the word 'commenter' for my blog posts in a social site.On a casual social site you can call your visitors who comment anything you wish. I think commenter is clear enough (from its parts) that almost everyone will understand what you mean.