Internet safety and the social media trap

I just don't feel safe on social media.  If I cannot handle the emotional "stuff" that comes from the posts on Facebook, etc., I do not understand how kids can.  Social media is good for keeping in touch, but I guess I am old school and prefer to do it through the mail.  Too many people know way too much about accessing what is supposed to be "private" information.  It makes me uneasy.