Are my parents invading my privacy?

[Lauren]

My mom took my iPod without me knowing and cracked the screen lock code to get into it. She then went through my facebook, twitter and tumblr accounts. My facebook and twitter don't really have anything personal on it, but she went through my tumblr and now thinks I'm depressed or have other issues, when in reality a lot of the posts are sarcastic/humorous. She told me it was "on the internet therefore open to anyone" but I have no pictures or information about me on my blog that would make anyone else reading it know that I run it. She only saw it because she went through my iPod. I like to write and share my work online because I'm writing a book, but no matter how anonymous I am on an account my mom always finds it and reads it. She doesn't normally say anything but I want her to just give me space because I do tell her what I do on the internet (I told her I had tumblr) but it's humiliating when she makes all this public when I am anonymous on the internet and had she not searched my ipod/computer she would know know I run that account. Is she invading my privacy?
They also don't have any reason to search my stuff. I am a good kid, don't do drugs or drink at all, get very good grades and spend time with my family.