Instagram is introducing a new "story likes" feature. The feature was unveiled last week but appears to have only arrived for many UK users today.
Story likes allow you, as the name suggests, to like someone's story. This means you don't clog up their DMs with reactions, like you had to do previously - though you can still do so if you prefer.
“So now, as you go through Stories, between send message and that little paper airplane, there will be a heart icon,” Instagram head Adam Mosseri said when he revealed the feature. “And if you tap on it, it’ll send the author of that story a like, and that like will show up in the viewer sheet, not in your DM thread with them.”