Two weeks ago, LinkedIn went public with a major bang, creating overnight millionaires, ’90s style. Is there bubble trouble on the horizon? This infographic from The Atlantic, called “Recent Over-the-Top Valuations Explored,” illustrates the rapid acceleration in the perceived worth of prominent web companies like Facebook, Twitter and Groupon. Note the revenue-to-valuation ratios. (Click on the graphic then the zoom-in icon for a better look.)

And you can listen to a bubble rap with the Economist’s U.S. tech correspondent, Martin Giles, on today’s Forum program from KQED Radio. That show will be archived here later today.

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