Live Photos is now the default mode on iPhone 6S and later if the feature isn't switched off, with the same editing options for stills available from Apple's Photo app.
Apple's developer website features details on a software development kit for building apps for iOS, macOS, and tvOS.
Notably, social media platforms including Facebook and Instagram only support Live Photos converted into Boomerangs. Of course, it's up to the web developers to add this API to their sites, so you'll have to wait for your favorite sites to enable support before you can start sharing your Live Photos with everyone on the web. And it's a boon for users, who get to see their Live Photos presented as intended.