Is it wrong to not want to be friends with your mom on Facebook?

[hai]

I just don't want my mom rummaging through every inch of my life like that. I don't want to have to worry about my mom looking at everything that goes on my wall or every picture I'm in, even if it isn't bad. I just don't want to have the "so what was that on your wall" conversation. I want a Facebook to keep in touch with friends, but I don't have one for this reason. Is this wrong?
I've seen her spy on my brother's wall all the time and question things on there, so that is why I'm worried. She will definitely find me if I get a Facebook. Along with my dad, siblings, grandparents, cousins, aunts and uncles, etc.