[next89]

You are looking at it from the content consumer perspective. I'll give you the content producer view. When I realized that my Instagram pictures had far less reach on twitter than other options, I stopped using Instagram to share pictures on Twitter.

[madoublet]

Your experience might be different, but I know a lot more people who use Instagram in closed networks than open networks. I would speculate that its growth is tied more closely to closed networks than it is to whether it enables cards in Twitter.