What about snapchat? The instagram beta that has never been updated? Not to mention not getting any games until quite a while after everyone else...
I had windows phones for my last 3 phones because microsoft parents, and I always hated them
Screw snapchat, their CEO doesn't even give us a way to support it, so I switched to cyberdust, pretty much all WP users have switched to Cyber Dust by now, its way better than snapchat anyways.
As for the Instagram one the one by Rudy Hyun is pretty good, I recommend it.
Either ways if you really can't live without snapchat just wait for Windows 10 to become popular and bam you get your app, I really find not liking a OS because of a app missing kind of dumb.