While the rest of the country has spent the past year debating gay marriage, policing tactics, Obamacare, and Deflate-gate, the inescapable topic of discussion in Silicon Valley is whether we are in a technology bubble. Marc Andreessen, the co-founder of his eponymous venture firm, is perhaps the leading advocate against the bubble chatter. On his Twitter feed, he has referenced the word “bubble” more than 300 times, repeatedly mocking or refuting anyone on his radar who even hints at such a possibility. One of his arguments, as the slides in the Rosewood ballroom suggested, is the exponential growth of mobile phones, which have fundamentally changed the way we buy and sell virtually everything, from groceries to taxi-like services, and created unprecedented disruption. Also, in contrast to the days of the dot-com boom, many tech companies are creating revenue—in some instances, lots of it. ... there may be no greater monument to what’s going on in the Valley than the 1,070-foot edifice under construction at 415 Mission Street. The new, glassy Salesforce Tower is slated to soon become the tallest building in San Francisco, rising more than 200 feet above the Transamerica Pyramid. ... Snapchat has offered Stanford undergrads as much as $500,000 a year to work for the company. Jana Rich, founder of Rich Talent Group, a well-regarded tech recruiting firm, told me that she hasn’t seen such bidding wars since the late 90s. “I’ve seen two of these life cycles, where things are going fabulously well,” she said. “Then we have the bust. We are now, in my opinion, at the height of the demand curve.” ... “You know there’s a bubble,” the saying goes, “when the pretty people show up.” ... All across the Valley, the majority of big start-ups are actually glorified distribution companies that are trying, in some sense, to copy what Domino’s Pizza mastered in the 1980s when it delivered a hot pie to your door in 30 minutes or less. ... Or maybe it’s simpler than that. As one technologist overheard and posted on Twitter, “SF tech culture is focused on solving one problem: What is my mother no longer doing for me?” ... Either you can go public, which is inadvisable without a lot of revenue, or you can sell, which is difficult given the paucity of companies that can afford to make such an offer. So, for many, the choice becomes fairly simple. You continue to raise more and more money, or you die. ... countless people from all over want this to be a bubble and they want it to burst.