I know, I’m late on this. Here’s Marco Arment announcing the move:
I’m happy to announce that I’ve sold a majority stake in Instapaper to Betaworks. We’ve structured the deal with Instapaper’s health and longevity as the top priority, with incentives to keep it going well into the future. I will continue advising the project indefinitely, while Betaworks will take over its operations, expand its staff, and develop it further.
Not much to say except congratulations to Marco. As a fan of Instapaper, I’m happy to know that its development will continue, and that Marco will serve as an advisor to Betaworks as they grow the app/service.