Earlier this week, authorities in Iran blocked YouTube along with several other sites and mobile networks.  For YouTube, the crackdown has been highly effective, with traffic dropping by 90 percent.

This number is from internal log files provided to Beet.TV by a YouTube spokesperson.

I've pasted here a video of citizen video of someone apparently being beaten in the front yard by police officers. This was shot from above, presumably in Tehran. The video was not uploaded from Iran, but by a YouTube member in the United States.

Here is the unofficial Mousavi channel on YouTube.  It is the 30th most watched channel this week. Here is an index of Iran protest videos on YouTube.

Brian Stelter at The New York Times has a round up this afternoon on how traditional and citizen television news is covering the crisis in Iran.

More updates on Iran on CBSNews.com.

Here's a story on CNET News about how proxy servers are helping Iranians get around service blockage in their country.

— Andy Plesser, Executive Producer