Pop star Rihanna has urged fans to delete Snapchat after the social media app ran an ad making fun of her 2009 beating at the hands of then boyfriend Chris Brown.
Shares of Snap, the company that makes the app, have fallen 4.7 per cent in trading during the week.
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"SNAPCHAT I know you know you ain't my fav app out there! But I'm just trying to figure out what the point was with this mess!," the singer wrote on Instagram on Thursday.
"You spent money to animate something that would intentionally bring shame to [domestic violence] victims and made a joke of it.
"Shame on you. Throw the whole app-oligy away."
The 'Umbrella' singer was speaking out after Snapchat earlier this week apologised and took down an advert on its platform for a game called Would You Rather.
The ad showed pictures of Rihanna and Brown with the captions "Slap Rihanna" and "Punch Chris Brown". Both the ad and the game were unaffiliated with Snapchat.
R&B singer Brown pleaded guilty to assaulting Rihanna in 2009 in an incident that made headlines around the world.
Snapchat said the ad was disgusting and should not have appeared on its service.
"We are so sorry we made the terrible mistake of allowing it through our review process. We are investigating how that happened so that we can make sure it never happens again," the company said in a statement.
Rihanna's comments were the latest bad press for Snapchat.
Its shares lost about US$1.5 billion in market value in February. During the month, celebrity Kylie Jenner tweeted that she did not like the Snapchat site's redesign.
Dozens of fans have tweeted that they were following Rihanna's call to delete the Snapchat app.