srimadman found an interview with Wave creator Lars Rasmussen where he talks about his recent decision to join Facebook
, leaving Google behind. Apparently getting personally pitched by Zuckerberg helped. He says, "I've got a job description of 'come hang out with us for a while and we'll see what happens,' which is a pretty exciting thing." The article talks about Big vs Small companies, and notes that about 20% of Facebook's staff are former Googlers.