Regardless, this is still fair criticism. This would be like seeing in the scrolling banner of "Breaking News" on CNN "<Insert Well Known Person in their field> quits job at <Insert large company>"
Belongs in maybe the entertainment or business section, maybe, section, but wouldn't classify it as "tech news"
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Having thought about it a little more, I can see a valid case when said person in question, considered monumental enough, leaves a platform, business or field and is reported as news. I guess it's more of a reflection of how little HN'ers (including myself) think of Facebook in the grand scheme of things. It's just a website. What's next, we report that he or she has left Flickr or Reddit? That's kind of what I think GP and myself were getting at. Now if this person was the founder of Facebook, or instrumental in the success of the platform, and then decides to leave, I think absolutely it would be tech news.