Super Pumped: The Battle for Uber by Mike Isaac:
Rob Hayes, a partner at First Round Capital, saw Camp’s Twitter schtick and was intrigued. He sent an email, met the company, and quickly cut a check for nearly half a million dollars in the company’s first “seed” round of funding. Chris Sacca, a friend from Kalanick’s “JamPad” days, also threw in a chunk of capital, along with a handful of other close acquaintances who became “advisors”—a glorified title for early supporters. Of the early group of seed investors, though, Hayes and Sacca were the most hands-on, offering advice and strategy. Hayes and Saccas’s seed investments would one day be worth hundreds of millions of dollars.