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What constitutes a "startup"? Is it the age of a company? Its size? Its funding? Its profitability? Its position in the industry?

Steve Jobs often speaks of Apple's "startup" culture. Last week, an article in the New York Times referred to the seven-year-old airline Virgin America as a startup.

One of the more popular panels at SXSW Interactive this year was one called Beyond Aggregation. The panel included our very own Marshall Kirkpatrick, as well as Gabe Rivera (Techmeme), Louis Gray (LouisGray.com), Melanie Baker (PostRank) and Micah Baldwin (Lijit). The topics revolved around information gathering and management.

From the panel, Marshall and Louis had new sources and gathering tips, Gabe and Melanie weighed in heavily on how to manage information and Micah had some great suggestions on discovery of new information sources.