As a bit of catchup, Messenger Day's main rub is it hosts photos and videos that expire within 24 hours. You can add stickers (of which there are apparently quite a few) and filters to dress up your evaporating stories, too. So yeah, like the Facebook-owned Instagram's Stories feature, this is a carbon copy of Snapchat -- just without that app's lurid reputation.

How long before the app hits domestic shores, and its life expectancy if and when it does, are up in the air at this point.