Snapchat and Instagram were both struggling on Monday afternoon, with users unable to send chats. Tests of both apps showed everything else working -- on Snapchat you could send snaps and see stories and on Instagram you could view your feed and stories and send pictures.
Snapchat and Instagram back up and running after outage

Snapchat confirmed it was completely back online as of around 3:30 p.m. PT. Snapchat messages starting going through at around 2:30 p.m. PT.

"We're aware some Snapchatters are having trouble sending Chats. We are looking into it," Snapchat tweeted at 1:51 p.m. PT.

"The issue has been resolved," it then tweeted at 3:26 p.m. "If you're still having trouble, please let us know!"

Down Detector saw more than 25,500 reported issues with Snapchat, and 8,500 reports on Instagram during the afternoon. The problems were experienced globally, according to Down Detector's live coverage maps.

Snapchat (also known as SC or Snap)[citation needed] is a multimedia messaging app used globally, created by Evan Spiegel, Bobby Murphy, and Reggie Brown, former students at Stanford University, and developed by Snap Inc., originally Snapchat Inc.

One of the principal features of Snapchat is that pictures and messages are usually only available for a short time before they become inaccessible to their recipients. The app has evolved from originally focusing on person-to-person photo sharing to presently featuring users' "Stories" of 24 hours of chronological content, along with "Discover", letting brands show ad-supported short-form content.

Snapchat has become notable for representing a new, mobile-first direction for social media, and places significant emphasis on users interacting with virtual stickers and augmented reality objects. As of February 2018, Snapchat has 187 million daily active users.