Ask HN: How is Marc Andreessen able to tweet so much?

I know he's a super-intelligent and quick-thinking guy, but it seems humanly impossible to tweet as prolifically as he does, given the type of busy schedule I assume he has.

Occam's Razor makes me think he must have an entire team of ghostwriters who know him well and come up with a long list of smart tweet-length things that he would say, and then he publishes the ones he likes.

I've heard that's what other "social media mavens" like Guy Kawasaki and George Takei do, but I was wondering if there's anyone here who's "in the know" who could shed light on whether that's the case for Marc Andreessen as well.

Also, what do you think of this practice of ghost-tweeting? Does it feel inauthentic, or should it not matter as long as the content is interesting and fully endorsed by the person under whose name it's being published?