penp, as an american israeli I understand both mentalities. People in america can be very addicted (lihitmaker) to their facebook, twitter, and so on. They won’t admit it though.
I’m a teenager and my friends in the USA can be on it for HOURS. Documenting every part of their lives. But there are some who just have it becuase everyone else does and is not on it as much.
You my friend, need to do more research. You need to find out if she has a smartphone, try and find her profile from a friend’s computer to see how often she writes and what types of things she puts up.
Is it just when she does big things like vacations and outings or is she posting pictures of all her meals, talking to her friends for hours on it, and posting about things that should be private?
You have to see exactly where she is so you can know if you are comfortable with it. I understand you, the struggle is real. I also do not like FB. In any case if you do research and don’t find out enough about what is “yeshivish” I know this is not very normal, but perhaps she has a cousin, or relative you can call who will explain to you how open americans are with these things or even the family themselves.
Know one has to know you are calling for yourself, and I’m sure the family would understand seeing as you just want to understand the hashkafa before you can say yes becuase you don’t know if it’s matim for you.
I think you need to speak with someone. There are too many pratim to do this over the internet with a bunch of strangers.