This was everywhere last week, but in case you missed it, Alexis Madrigal's Atlantic interview with Pinterest co-founder Evan Stone is a great read, particularly if you buy into Benedict Evan's notion that we're in the pre-pagerank phase of mobile internet usage.
My contention is that Pinterest is one of the four ways that people find things on the Internet. The default, of course, is Googling (or—fine, Microsoft—Binging). For real-time searches, there is Twitter. For people or entities, there's Facebook. But if what you want to find are things, objects, then Pinterest is the way to go.
They cover a lot of topics, including about Pinterest's product differentiation; the balance of machine learning versus highly distributed editorial curation; deferring obvious revenue models as the value to consumers is still taking shape; and much more.