From organizing protests in Tehran to vote-swapping in Canada, social media is proving itself as an established organizing and communications tool. People use it, and often use it effectively. Naturally, some of those people are going to run afoul of the authorities they are organizing against.

Sami Ben Gharbia of Global Voices Online just launched an interesting new site: Threatened Voices.

The site also has a timeline tracking the trend of arresting bloggers over recent years.

You'll notice there's one entry for Canada. That's New Brunswick blogger Charles LeBlanc, who was arrested twice. Once he was rounded up with protestors, and again after he entered the New Brunswick legislature despite being barred from the premises.

Another Canadian blogger is in jail in Iran, and this week's episode of TVO's podcast Search Engine looks at his case:

Canadian Hossein Derakhshan brought blogging to Iran, reversed his politics, made enemies on both sides, got arrested and hasn't been heard from since- until now.

While "Hoder" remains in a Tehran prison, his brother Hamed brings news, breaking his family's silence.