HTC has updated its Sense 6 Gallery app through Google Play, introducing the ability to share live Duo Camera photos from the HTC One M8 on the web. Whereas previously you'd have to apply your effects and save a still photo before sharing, now you can share Duo Camera effect shots directly through a Google-hosted web page. Through this new Duo Effects Gallery, viewers can play around with refocusing shots and applying other 3D and artistic effects, just like they would on an M8.
HTC One M8 owners can find the new Duo effect sharing feature by first selecting a photo, then going to Edit > Effects and choosing an effect, then hitting the share icon in the top right corner. So there's a little work involved, and it's easy to miss if you're used to operating within Android's sharing intent system. But the resulting web-based widgets seem to work well enough, and you can embed them in web pages too.
M8 owners, be sure to share your Duo effect shots down in the comments!