Whitney Tilson is the founder and Managing Partner of Kase Capital Management, which manages three value-oriented hedge funds. He is also the co-founder of Value Investor Insight, an investment newsletter, and the Value Investing Congress (50% off till 6/24/14 Discount Code: VALUEWALK http://www.valueinvestingcongress.com/congress/register-now-partners/), a biannual investment conference. Tislon says that shorting Tesla Motors Inc (NASDAQ:TSLA) stocks was one of the biggest mistake of his career – He discusses this short, as well as his short in ZQK, which he decided to research before earnings and then when short – Tilson talks about how people are buying online, including his daughter who bought her prom shoes on Zappos. Below is the full interview on the topic.