Flagged. I don't really think it's appropriate to say that Paul Graham "endorses" bitcoin just because his company has funded a startup that's going to try to work in that space. That's putting words in the man's mouth. Maybe he only thinks it has a 10% chance of working, but it'll be big if it does. Maybe his team is convinced that this will work, but he is not. Saying someone endorses something is making a pretty big claim about their thoughts on an issue. That claim does not have sufficient evidence behind it in this case.
Probably a fake account made under his name on their test system. But perhaps not. It certainly doesn't count in my mind as evidence that PG endorses Bitcoin.
This is being reposted. The last post got killed from the front page due to a paragraph which was giving prizes through coinbase.com to first 5 insightful comments. That's now been removed as it was seen as scammy/cheating and of course that was not the purpose of it.