Epidemic: Scared of standing by your feedback

This was posted by "anonymous" as feedback to Nearby Tweets on User Voice:

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I would consider it to be an epidemic on the web that when people provide negative feedback, they choose to stay anonymous. It's here and I see it in my blog comments.
 
1. If you're going to provide feedback, be specific
2. If you're going to provide feedback, be man (or woman) enough to stand by your words.
 
You are accountable and responsible for what you say. It's a shame that people use anonymity in this way.