Blogging in Iran
Iranian authorities are stepping up arrests and pressure on popular bloggers as part of a wider Internet clampdown launched after hard-liner Mahmoud Ahmadinejad became president last year.
Thousands of websites have been blocked, and a prominent Iranian human rights lawyer says at least 50 bloggers have been detained since last year.
At the same time, Iran's president has started his own blog.
Guest: Hossein Derakhshan, a popular Iranian-born blogger now living in Toronto