Are you on Facebook? Are you friends with your young women on Facebook? Why not? Either way - teens and children need to be taught how to safely browse online or else they may find themselves seeing things that they really shouldn't be looking at. Adults can use a little reminding every now and then, too.
Facebook offers some advice for staying safe. You can find their help pages on internet safety here. I would also recommend reading church articles on internet safety and use your own experience to teach about being safe online.
Happy, safe web browsing!