This is a fantastic move for Microsoft, and IMO, a premature throwing-in-the-towel moment for LinkedIn. At $26B, that's less than 10% of Facebook's market-cap. That's a steal for the world's biggest Social-Professional Network, and the medium through which most recruiting could conceivably happen in the future. Given that MS currently has no social presence at all, but has a fantastic enterprise sales channel, LinkedIn is a great asset for them.

The idea of going to physical career fairs in thousands of colleges around the country, and collecting/handing out paper resumes just to make the connections happen, always seemed like a woefully inefficient way of connecting job seekers with employers. In the future, this process is going to become more and more digital, and networks like LinkedIn are going to become vital hubs in this new wave. If Microsoft can find a way to accelerate and monetize this trend, this acquisition could well be one of the best deals of the decade.