I'm not sure that's the specific goal of this move. It's very doubtful any company has suddenly reversed their market position by switching two executives' posi

I'm not sure that's the specific goal of this move. It's very doubtful any company has suddenly reversed their market position by switching two executives' positions. However, it's likely this move is more intended to send a message to the other executives that whatever their position, even the leader of Tumblr, that maintaining a narrow market for a platform is unacceptable. I doubt Marissa thinks that the switch will actually expand Tumblr's market share, but that it's a future-looking move that will encourage other execs to engage a broad audience. I don't know how effective it will be, but I'd bet dollars to dimes that's the motivation.