> integrates perfectly with their core photo sharing product This is the key thing. While I don't use any of their Snapchat cloned features, I do think their p

> integrates perfectly with their core photo sharing product This is the key thing. While I don't use any of their Snapchat cloned features, I do think their photo product is very good. So you can see what they are doing to users like me. I'm now more likely to use their stories because I already like the core product. Also, celebrities have a higher reach on Instagram than on Snapchat, so the transition for them is seamless while also maintaining (and increasing) their existing follower base.