Parents have raised concerns about the use of social media platform TikTok, after videos of school students imitating sex acts and miming to explicit songs surfaced online.
The obscene videos have been posted on the social media platform, which is focused on short clips, often to music.
Once known as Musical.ly, TikTok was taken over in 2017 by the Chinese technology company ByteDance.
The ABC has been supplied several public videos of students from various South Australian schools filming content in uniform.
In one video which appears to have been filmed on the grounds of a regional state high school, two male students are simulating a sex act.
Other videos are filmed inside school bathrooms, on school ovals, and in classrooms, while others have been filmed away from school.
The videos often included students lip-syncing to rap music, and make reference to sexual acts, racist language and spreading sexually transmitted diseases.
One parent who spoke to the ABC, who did not want to be named, said she had repeatedly raised the issue with her child's Catholic school Xavier College in Gawler
The mother said some of the videos had been filmed inside change rooms and school toilets, but little action had been taken by the school.
She said one clip featured both racist and sexually explicit language, which the ABC has chosen not to repeat.
She said she felt the videos showed "complete disregard" for girls and women, and were worse than recent footage of St Kevin's College students engaged in sexist chanting in Melbourne.
"There was one clip that was removed and there were these older boys who were talking about 'I don't chase no b*****s'," she said.
"Are they going to go and treat a girl at the school like that? You don't know."
In a letter sent to the school, the parent said "dozens" of videos by Xavier students were now in the public domain and accused a senior staff member of not taking the matter seriously.
In a statement, Xavier College said the videos posted online showed the importance of continuing education round the use of social media
Opposition child protection spokeswoman Jayne Stinson told ABC Radio Adelaide that she had received numerous complaints from parents.
She said the main concern was that videos were being filmed while students were in uniform, on school property and in school hours.
"Some parents have raised with me that they don't think that's really a good use of school time," she said.
"Also a lot of the kids are doing some pretty sexual movements in the videos."
South Australia's Education Department said it had a range of strategies to help children and young people to be safe online, including the Keeping Safe: Child Protection Curriculum.
"The department has a range of strategies to help children and young people to be safe online. Schools address these topics through the Australian Curriculum, Keeping Safe: Child Protection Curriculum and a range of educational resources," it said.
"There are also consequences for breaches of school and departmental policy. Schools have the authority at a local level to deal with online behaviours that are connected to the school."
An attempt to 'go viral' or 'become famous'
Immanuel College, which has public videos of students featured on the app, but not the incidents stated above, issued a warning to students about posting to TikTok.
Director of community relations and development Steve Blight said once the school was aware students had posted footage on TikTok, it acted quickly to remind them of the school's policies.
"It has become popular to create a short video in school uniform or even at school in an attempt to 'go viral' or 'become famous'," he told the ABC.
"As soon as we became aware at Immanuel that there were TikToks on the app in which our students were featured, we communicated with our full student body to ensure that they understood this was against our policies and that there was a significant privacy risk for students."
Cabra Dominican College principal Helen Riekie also released a statement saying the school was committed to educating students to become "healthy digital citizens".
"If the college becomes aware that a student has posted something inappropriate, we work with them and their parents [and] caregivers," she said.
SA Secondary Principals' Association president Peter Mader said the behaviour depicted in the videos was "completely and utterly unacceptable", but said it was up to individual schools to determine their own social media policies.
Parents need to 'understand what their children are doing'
Online safety and digital wellbeing expert Martine Oglethorpe said parents had a reason to be worried, but it was not just TikTok that was being used in this manner.
"Certainly there is that concern that not only could your child be participating in that, but there's also those kids that are viewing it as well."
Ms Oglethorpe said most parents did not fully understand how the apps worked and were sometimes tricked into a false sense of security.
"That's where we found a lot of young people are getting into trouble."
'Very easy to identify them' in school uniform
Ms Oglethorpe said parents needed to understand the dangers such apps pose for children, particularly while on school grounds or in uniform.
"What parents need to understand is any social media app that is out there, you have the ability to share things that we shouldn't be sharing, to be seen by people we didn't intend to see it," she said.
"We have the ability to be contacted by people that are not safe for us and we have the ability to see content that is not made for our eyes.
She said it was also clear that the younger generation had a different notion of privacy.
"We grew up in a world that was very private and you had to work hard to be public, whereas today we're all very public and we have to work really hard for that privacy," she said.
"There's still that notion of not realising how many people are seeing the things they are putting online."