This has been discussed before (notably here). The gist was basically that you should be voting based on the quality of the post, not based on who wrote it.
Having said that, though, I'll admit I don't bother voting ++ or -- for postings by our anonymous friends. I rarely see anything worth voting up, and for those postings I'd normally --, I don't bother once I see who posted it...I'd rather save my vote for someone who deserves a ++.
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