I find it completely hilarious that Marissa is not dogfooding. I know that someone else said this earlier in the thread, but why is this on Instagram and not flickr? Come on, at least use your own damn product.
The correct answer to the objection of "but Instagram is better right now" is "I'm going to revitalize this product by using it for my own photos and commentary, even if it sucks right now."
You don't want the CEO of a company giving mindshare to a competitor!