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With Twitter and other social media, NPR's Andy Carvin monitored immediate, on-the-ground developments during the upheavals of the Arab Spring from Washington, D.C., through thousands of tweets and an army of followers that numbers in the tens of thousands. Now, he is in Libya, meeting face-to-face with some of those activists. He'll be sending us periodic updates on his journey.

International pressure is building on Iran. On Wednesday, Iranian leaders claimed they made strides in their nuclear program and threatened to stop supplying oil to six European countries. Host Michel Martin hears what people inside the country think about the tensions. She speaks with writer Hooman Majd and human rights activist Sussan Tahmasebi.

China's economy sailed through the financial crisis unscathed — at least in the short run.

When the global crisis hit, the country's government-owned banks started lending out lots more money. The money came largely from the savings accounts of ordinary Chinese people. It went largely to finance big construction projects, which helped keep China's economy growing.

A closed-door summit on controversial bird flu research starts today, and the newly released guest list reveals that the event will be dominated by virologists.

Rick Santorum released four years' worth of tax returns Wednesday evening which showed that he is wealthy by any measure.

But his returns may also allow his critics, both those aligned with Mitt Romney, his chief rival for the Republican presidential nomination and those who aren't, to attack the former U.S. senator from Pennsylvania for not giving as much to charity as many others at his income level.

The world of international relations seems to have focused on Pakistan today: The president of Iran and the president of Afghanistan both made their way to the country just as tensions between Iran and Israel made the news and just as reports emerged that the U.S. and the Taliban were beginning secret talks.

The official agenda of the meetings is to discuss counter-terrorism and transnational organized crimes at a regional conference tomorrow in Islamabad.

The meteoric rise of New York Knicks point guard Jeremy Lin has echoes of Tim Tebow, the Denver Broncos quarterback who caused such a stir last fall.

Transcript

STEVE INSKEEP, HOST:

A record rebound for General Motors is at the top of NPR's business news.

(SOUNDBITE OF MUSIC)

INSKEEP: Let's remember the carmaker almost collapsed two years ago and needed a government bailout. Today, GM announced it earned its largest profit ever in 2011.