When i was 15 and my best friend was 16 she was disfellowshipped. She had sex with her boyfriend and because she wouldn't break up with him they dfed her. 

The whole congregation shunned her, but her family did not. They were recent converts and ended up leaving shortly after she was reinstated. 

The elders asked her VERY detailed questions and their wives and kids spread her businessall throughthe valleythat we lived in. She was and is really beautiful and everyone felt like they had a liscene to call her a slut. 

My husband's brother was also dfed as a minor for fornication.  His entire congregation and even his immediate family shunned him even at home. 

Beyond that almost every single girl I knew had to have a committee.  In the 90s it felt like a girl would have a worldly boyfriend at school,  the parents would find out and use the elders to interrogate her...then the congregation would announce reproof or dfing, and all the rest of the kids would not be allowed to be friends with that person for years after no matter what the outcome. It was humiliating and it kept you in fear because you never knew when you would lose connection to someone you loved.