The largest and maybe most publicized VC exit of the year has finally closed. Announced back in Feburary, Facebook has acquired WhatsApp, the mobile-to-mobile, cross-platform messaging software company; the deal includes about $4.6 billion in cash along with 177.8 million shares of Class A Facebook stock, valuing the deal at nearly $22 billion at the current market price. WhatsApp, which had operated independently since the time of the acquisition announcement, will be integrated into Facebook's offering. Jan Koum, the company's founder, has taken a seat on Facebook's Board of Directors. WhatApp raised over $60 million in VC before being acquired. Sequoia Capital held about a 17% stake in the company.