This book dives deep into the history of PayPal. It's a riveting tale of Silicon Valley entrepreneurship in the late 1990s and early 2000s. PayPal went from a small startup (actually, two small startups) to IPO and shortly thereafter acquisition by eBay in less than 5 years. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.