"Why aren't you dead?"
"You should die."
"Wait a minute, why are you still alive?"
"Go kill yourself."
It's impossible to comprehend another human being, let alone a child, sending such hateful messages to another person, but according to Polk County Sheriff Grady Judd in Lakeland, Florida, these messages are all too real.
They were sent to 12-year-old Rebecca Sedwick, who ultimately jumped to her death in September, he said. The messages didn't come via the social networking sites many of us are familiar with: Facebook, Twitter or Instagram. They were sent via newer, lesser-known social applications called Ask.fm and Kik, according to Judd.
"These apps are free, and as a result ... you can either go up anonymously or create a fictitious identification, and you can torment other children, and it is frightening to see that occur," the sheriff said.
Tricia Norman, Sedwick's mother, thought she was doing everything she could to protect her daughter from the bullying she was experiencing. She sent her to a different school and closed down her Facebook page, according to The New York Times.
She had no idea her daughter was using apps such as Ask.fm and Kik, and was being tormented on the new platforms. "I had never even heard of them; I did go through her phone but didn't even know," she told the Times.
"Even though (Rebecca) was separated from the bullies because she was in a different school ... ultimately they were able to get back and I don't know if it's pick at each other but certainly say hateful things," said Judd, whose office is investigating the case.
"At the conclusion of the investigation, if our detectives can put together a credible case, they will charge those responsible with felonies," Judd said. "We take bullying and cyberbullying exceptionally serious in this county and always have."
'Parents don't know about them'
In conversations with law enforcement, educators, bullying experts and parents, it's clear that while parents may be getting up to speed on some social networking sites such as Facebook, Twitter and Instagram, there are plenty of other platforms popular with tweens and teens that parents don't know.
In addition to Ask.fm and Kik, there's Voxer, which is a walkie-talkie-type app for messaging, and Snapchat, which allows the sender to set a time limit for how long recipients can view their photo, text or video messages. (Check out our gallery above for other sites your teen might be using!)
"The biggest part of these sites is parents don't know about them," said Sue Scheff, author of the book "Wit's End: Advice and Resources for Saving Your Out-of-control Teen."
"What happens is a new site, we won't find out about it until a tragedy happens but the kids know about it," Scheff said. "It's as simple as that. No one really knew a lot about Ask.fm until Rebecca died."
How children are using the sites is a concern for parents and educators across the country. Brian Lidle, the principal at Ann Simpson Davis Middle School in Dublin, Ohio, said he's seen as many as a dozen cases of student harassment on Kik during the past several months.
"It's just a very difficult thing to see, a child being harassed by nameless, faceless people and feel ganged up on," Lidle said. He said that the school has gone to the authorities but that Kik has not shared information about who is behind the harassing accounts.
"We were very frustrated at that point, so what we decided to do is really get the parents in the mix," Lidle said. "And as we get information in, I've been sharing that with our parents through our e-mail list service and just to make sure they know what apps are out there, what's happening to them."
We contacted Kik for comment but did not get a response. In a statement, an Ask.fm spokesman said that in light of recent events, the Latvia-based company is working with online child safety expert Annie Mullins to review and update its safety and privacy policies to ensure that its "abuse and inappropriate content reporting systems are among the most effective in the industry."
"We are committed to doing everything we can to protect our users and stamp out bullying or any other kind of abuse. Sadly bullying can take place anywhere -- on or offline -- so it is important we, parents and users work together to fight it," the statement said.
"If a user sees something that isn't appropriate before we do, we would ask that they help us stand up to bullies by reporting it. Any complaints made about this kind of abuse are prioritised automatically and will be dealt with immediately."
Teens want to be 'validated'
Why are kids downloading these apps? Sameer Hinduja, criminology professor at Florida Atlantic University and co-director of the Cyberbullying Research Center, says part of the appeal of platforms like Ask.fm -- where you create a profile and allow people to ask you questions -- is the need for affirmation.
"You need to be validated when you're a teenager because you are wondering if you're turning out OK, and so these sites completely meet that need," Hinduja said. "Because it's like, 'This is so great. Someone asked me a question. Someone took the time to visit my profile ... and like my picture and leave a comment.'