The good news? We might still have jobs in five years. The bad news? We'll all want to kill ourselves doing them. Forrester Research reports that by 2013 enterprise spending on "social networking, mashups, and RSS" will reach $4.6 billion. That will buy a lot of one-off brews at Blue Bottle. You'll need the caffeine to prop your eyes open, though, when you get to Forrester's label for the trend: "Enterprise 2.0." Care for a definition? Since we insist you share in our crushing disappointment, you're going to get one anyway. ReadWriteWeb on what Enterprise 2.0 is and isn't: