<human>: Can you give me the gist of the text in a nutshell?

I just received a text message from my mother asking me to talk to my younger sister about the dangers of the internet. She asked me to talk to my sister because she looks up to me and views me as a role model.

My younger sister was in her room, playing with her iPod touch. When my mother came in the room she was very clearly making an effort to keep the screen hidden from my mother, which naturally caused suspicion. When my mother asked her what she was doing, she pushed her phone under the bed. As my mother reached for the phone my sister started crying and kept apologizing. It turns out my sister was in a chat room called "Sexy Bitches" and was chatting with three people. My mother didn't mention what the conversation was, but I do not believe it was sexual in nature. She also mentioned that my sister had posted videos of herself on the internet. Again, I don't believe they were sexual in nature, however I'm still awaiting confirmation.

I believe the reason my sister is behaving like this is because she does not feel loved or wanted. Our mother is emotionally, and frequently physically abusive. She has gotten better with age, with less physical abuse, but I know the damages that emotional abuse can cause. How can I talk about this with my sister and encourage her to be a mentally healthy young person so that she doesn't seek love and affection from potentially predatory individuals on the internet? Is it worth confronting my mother about the changes she needs to make to be a better parent?

Additionally, how can I help my divorced mother and father protect my sister from this? Are there parental controls my parents should consider? Inevitably she's going to have to use the internet again.

I live thousands of miles away from my family and will be calling my sister tonight after work. I want to make sure it's a productive conversation that doesn't shame my sister. I greatly appreciate any advice you can offer.
<bot>: younger sister caught chatting with multiple strangers, mother asked me to talk to her about it; how can I make the conversation productive?