Days after angry Iranian students overran the British embassy in Tehran, The U.S. has opened its new "embassy" for Iranian citizens. Senior U.S. diplomats haven't returned to Tehran after more than 30 years - this department is web only.

The front page features a welcome video from Secretary of State Hillary Clinton, and the seal of the State Department, with the banner "Virtual Embassy of the United States, Tehran - Iran" set at the very top.

But as the welcome message reads,

Facebook has developed new privacy features and agreed to 20 years of independent audits of its privacy practices. Google and Twitter previously settled similar cases with the Federal Trade Commission. Farhad Manjoo argues that Facebook, or any social network, can never be truly private.

NPR's Neal Conan reads from Talk of the Nation listener comments on previous show topics, including advice for NPR's new CEO, Gary Knell, and the moments when a writer realizes he or she has become a poet.

A federal appeals court ruled that most bone marrow donors can be paid. The decision has sparked debate among advocates who believe compensation will create incentives for people to donate bone marrow, and the Justice Department, which argues compensation may compromise patient safety.

The U.S. Postal Service has announced it will move forward with plans to close some 250 processing centers and lay off workers. The cuts may help save $3 billion a year by 2015, and could add a day to the delivery time of many shipments. The USPS is also reviewing post offices for possible closures.

Rep. Peter King is set to continue his series of controversial hearings on the radicalization of American Muslims with a fourth one tomorrow. King, a New York Republican along with Sen. Joe Lieberman, an independent from Connecticut, will explore how radicalization threatens the military.

Yet another sign of the very diverse interests of the world's webizens:

Twitter says the top two hashtags this year have been #egypt and #tigerblood.

Egypt went to the top of words to search and post thanks to the Arab Spring and the uprising that toppled President Hosni Mubarak. As for No. 2, its popularity is all due to actor Charlie Sheen and his famous claim to have "tiger blood."

The 2011 National Drug Threat Assessment put Kansas City on the map, but not in a good way. For the last four years, the assessment has compiled national trends about drug usage and distribution throughout the United States. The maps featured in this year's assessment show Kansas City as one of the major routes for the distribution of illegal drugs.