Today we learned security breaches are costly! After a glorious IPO, LinkedIn’s stock value dropped more than 7.2 percent when a blogger in India discovered that user accounts are relatively easy to hack; Sony’s stock has suffered lately due to the earthquake in Japan and a string of embarrasing hacks.

Adrianne Jeffries is the editor of Betabeat. Follow Adrianne on Twitter or via RSS. ajeffries@observer.com