After a tumultuous 2017 that saw a $US2.2 billion ($2.8 billion) loss in its first quarter of public listing and hundreds of thousands of unsold video-recording sunglasses, Snap's run of bad luck seems to be continuing.

Users have taken to Twitter to slam a major update for the Snapchat app, which merges the original 'Stories' screen — where content could be shared for 24 hours — with the page used to display individual messages and snaps.

"Snapchat has had a complete rework in an update and honestly it's disgusting," one tweet read. "It's so weird to use and I don't know why it's been changed."