You create your own page and people can ask you questions completely anonymously. Googled my child's name, and it came up. So his friends....or anyone...can ask questions anonymously. Or just post threats or insults. Anonymously. There is talk about drugs, denigrating talk about women in general, classmates in particular, calling each other gay, etc.
His 14 year old friend (girl), who has a steady boyfriend, has been asked how often she gives boyfriend blow jobs. Calls her a pedophile because her boyfriend is one year younger. Most of his high school friends are on there. Linked together by "likes" . They are all answering a combination of nice questions and fending off verbal attacks. Then they come to each other's defense.
And again, this is all open to the public. These kids don't think their parents are searching, and maybe they aren't. I just started looking into it myself.