Netizens have discovered something unusual about Facebook's search function.
When you type "photos of my female friends" into the social network's search bar, it suggests looking for photos of your girlfriends "in bikinis" and "at the beach".
These suggestions are ranked above others for photos from "this month" or "this week".
When you search for photos of your male friends, however, no suggestions are offered.
The ABC tested this and got the same results.
The quirk was exposed after Belgian security researcher Inti De Ceukelaire tweeted about another odd search result he'd encountered.
Earlier this week he found that when he searched for photos of his male friends, Facebook automatically suggested searching for pictures of his female friends instead.
When questioned about the bikini suggestions, a spokesperson from Facebook told Fast Company it was a "bug" they were working to fix.
But it then reportedly clarified that it wasn't a glitch at all, and the site was simply making suggestions based on popular and recent searches.
It acknowledged, however, that those suggestions weren't necessarily what people wanted to see.
"Facebook search predictions represent what people may be searching for on Facebook, but are not necessarily reflective of actual content on Facebook," it said.
"We know that just because something doesn't violate our Community Standards doesn't necessarily mean people want to see it, so we're constantly working to improve search to make sure predictions are relevant to people."
Hacker De Ceukelaire labelled the quirk "sexist", but others said it was "creepy" and a "violation of women's privacy".
Last year, secret documents revealed Facebook was linked to a company that had created an app called "Pikinis", which helped users search for photos of their Facebook friends wearing bikinis.
Created by Six4Three, the app relied on Facebook users' friends data to work, but Facebook took away developers' access to that data in 2015.
