Mark Zuckerberg's sister and former head of marketing at Facebook has complained of a privacy breach after a photo of her family was posted on Twitter.
Randi Zuckerberg posted a photo of her family, including Facebook creator and CEO Mark, reacting to the company's new Poke app on her Facebook page for her family and friends to see.
Yesterday the image was shared on Twitter by Callie Schweitzer, director of marketing and projects at VoxMedia.
A Twitter conversation between the pair has since been deleted but BuzzFeed reports Ms Shweitzer wrote "@randizuckerberg demonstrates her family's response to Poke" with a link to the photo.
"@cschweitz: Not sure where you got this photo. I posted it only to friends on FB. You reposting it on Twitter is way uncool," Ms Zuckerberg replied.
The VoxMedia executive then attempted to explain herself but did not receive a public reply from Ms Zuckerberg.
Ms Zuckerberg later posted a comment about online etiquette without referring to the incident.
"Digital etiquette: always ask permission before posting a friend's photo publicly. It's not about privacy settings, it's about human decency," she wrote.
Social media news website Mashable described the incident as ironic after Facebook-owned Instagram's recent PR fiasco.
The photo-sharing website angered many users earlier this month by issuing an unclear statement that was widely interpreted as giving the firm permission to sell users' photos to advertisers.
Author: Martin Zavan, Approving editor: Fiona Willan