gefen,
its the bits and pieces. In one thread its that you’re the X child in the family. In another its that my third sister got engaged last night … in another its your age…that your brother went to yeshiva xyz …. your sister is going to seminary xyz this year… you went to camp xyz for the past 4 summers….
Add it all up and an identity can be blown. It has happened here.
Also, remember that kids are more trusting and give info easier. You know how on your birthday thread you kept refusing to give your age? I bet most teens would have given in and revealed their age to someone who was so persistent.
You have said that your kids post here – just be aware that there are creepy people even on a site like this one and watch their backs.