In the technology world, no question comes up more frequently these days than "Are we in a bubble?" And while it's not up to us at CNBC to answer that question, we do sometimes happen upon little nuggets—data, anecdotes, tweets and the occasional wild party—that can possibly help others make their own assessments. When we do, we'll share them in a little column we're calling: "Bubble watch?"
If you're a businessperson under 40 and you don't work in technology, good luck catching the attention of Fortune's "40 under 40" list.
Almost half (19 to be exact) of this year's list, released on Thursday, comes from the tech industry. The top three in the rankings—Uber's Travis Kalanick, Airbnb's Brian Chesky and Facebook's Mark Zuckerberg—all hail from the Internet.