Webcasting: A Few Tangles

I read "Webcasting" (Special Report, Feb. 24) with great interest. The arrival of webcasting raises a slew of questions: How does one value cafeteria-style information from a provider that scans, filters, and interprets information according to its own priorities and interests? When content is delivered without knowledge of context, is it information or junk? How much should one reveal to get customized information?

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