Does Twitter Censor?
Claire posted at her blog on the possibility that Twitter censors tweets. She raises two points: Are they doing it and, if they are, is it unethical?
Here's a blog post that suggests it's not a matter of ethics because of the way the standard Twitter algorithm was constructed. I don't know if this info is accurate. And even if it is, you could argue about the assumptions - the ethics - built into the original algorithm.
So what a sweet sweet topic that we will continue to pursue.