Updated: Silicon Valley, once known for groundbreaking innovation and amazing new inventions, these days makes news by personnel moves and executive exits. Not that there’s anything wrong with that — but it’s worth pointing out. Here are some of the latest moves:

• Facebook got a new COO, Sheryl Sandberg, a month after Chief Revenue Officer Owen Van Natta left. Last month, CTO Adam D’Angelo left. Today, Matt Cohler, one of the oldest Facebook employees, left the company to join Benchmark Capital as a general partner. No surprise by Matt’s move because he’s really tight with the eBoys. His exit says a lot about Facebook and its future. Looks like Sheryl is making some changes there. Matt called and pointed out that I was totally wrong about his relationship with Sheryl, who remains a close friend of his. My bad.
  
• Jeremy Zawodny, ex-Yahooer, is joining Craigslist. I couldn’t be happier for him and his new bosses, for they are like peas in a pod.
• Yahoo is losing even more executives — Senior VPs Brad Garlinghouse, Qi Lu and Vish Makhijani are hightailing out it of Dodge, continuing a Yahoo executive exodus that started nearly two years ago but went unnoticed. The only organization more dysfunctional than Yahoo? The New York Mets. My two cents: Jerry should totally recruit from outside of Silicon Valley and bring in a lot of fresh blood. Yahoo needs a cultural cleanse, quickly.