Instagram today is introducing Instants, which is both a feature and an app. Instants is billed as "a new way to share in the moment - with spontaneous, unfiltered photos" that go out to your friends. These are ephemeral to viewers, but are saved in your archive for up to a year and can be reshared as a recap to Stories.Your friends can react and reply, with replies going straight to your DMs. The new Instants "companion app" provides quicker camera access for the feature and is now rolling out to iOS and Android "in select countries". So Instants is basically just a...