It's quite a confident response, and there's no doubt the company has had a huge year — but despite that year of growthj, Instagram is still much smaller than Facebook and will always have a smaller feature set. Systrom did quickly pull things back a bit, saying "will we continue to grow at this rate [and outgrow Facebook]? Different question." His fellow co-founder Mike Krieger was asked the same question and had a bit more of a diplomatic response. "I don't know — that's a good question. I think both of them are basically limitless in size, so maybe one day they'll be the same size?"