For all the issues with the Duo Camera on HTC's flagship One M8, the selective focus thing is pretty fun to play with. With the newest update to the HTC Gallery app in the Play Store, M8 owners can share Duo Camera images to the web that anyone can use to change the focus. It's sort of like those Lytro camera embeds.
Now, you can share with your friends your images with 3D-effect or Ufocus images as an interactive image online. It's a software trick, but it's more reliable than most similar solutions on other devices. In the updated Gallery app, just share your Ufocus edit and you can embed the image anyplace online. It's also hosted by HTC.
In order to access this feature you'll need to Update your HTC Gallery App from the play store.