Today's episode looks at the "Billion Dollar Startup Club" and how a subset of tech start-ups are attracting venture capital and valuations in the billions -- with a B -- even though some of them have yet to pin down the monetization question.

Sean O'Reilly and Dylan Lewis look at some examples, delve into what VC players see in these social media start-ups, and who's doubling down even as this isolated but high-stakes phenomenon begins to look more and more like a bubble.