Of its 600 million users, Instagram now has more than 200 million users posting to or interacting with Stories every day, while Snapchat reportedly has around 158 million people using the original ephemeral social networking app, as of the last count. Snapchat's numbers don't specifically tie into use of its own "Stories," and include any interaction with the app, from text messaging to video calls.
That last Snapchat update centered on data related to the fourth quarter of 2016, so it's likely those numbers are higher, but the growth of Instagram Stories in less than a year is quite noticeable.
Facebook's copying of Snapchat in Instagram has gone far better than the same plan that the company recently enacted within Facebook itself, called Facebook Stories. Following a weak launch, the company updated its iOS app to make it look as if people were posting to Facebook Stories, when in fact they weren't.
In more general update news, users on Instagram Stories can now create "Selfie Stickers" to post on their Story, which can also be pinned to specific places within videos. Today's app update also makes it easier to get to your favorite stickers, includes simplified video controls, and comes with new geostickers for Chicago, London, Madrid and Tokyo.