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STEVE INSKEEP, HOST:

Some new research throws into question things we say all the time about the Internet. The research focuses on Twitter, the service that lets many millions of people send short messages to each other from computers or cell phones. It's commonly said that social networking like this is revolutionary, that it's created new communities, even that it's obliterated geography. You can connect with people who share common interests, not just people who happen to live nearby. NPR's Shankar Vedantam is here to explode all that. Hi, Shankar.

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STEVE INSKEEP, HOST:

And today's last word in business follows up on the business of Jeremy Lin, the Chinese-American sensation for the New York Knicks. You know, if you had a dollar for every news story that has used puns on his name, like linsanity, you would be lincrediably wealthy, but we would never lindulge in such things. So let's go straight to the way people are making money.

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(SOUNDBITE OF MUSIC)NPR's business news starts with lower European markets.) Transcript provided by NPR, Copyright National Public Radio.

The financial battle for the Republican nomination is tightening. Candidates spent a lot of cash in January — what with contests in Iowa, New Hampshire, South Carolina and Florida. Also spending a lot of money, as it turns out, were the richly financed superPACS that support the candidates.

Reports filed at the Federal Election Commission on Monday night show just how important a superPAC can be.