Megan McArdle, Columnist

140 Characters, Zero Dollars

After Twitter's IPO is over, how will it make money?
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So Twitter opened at $45.10 in its first day of trading. Call me a fogey, but I just don't get it.

Don't get me wrong: I love Twitter. I spend all day on Twitter. I check my account with a regularity usually observed only in lab rats that get cocaine every time they press a lever. Thanks to my assiduous tweeting about everything from the gold standard to dinner-party menus, my account (@asymmetricinfo) has an impressive 17,550 followers. This is a full 1/375 of a Snooki.