Should parents be able to monitor their teens' social media sites (facebook, etc.)?

[angel]

I hate those parents that are like "they may have zero privacy"
I don't think it's necessary. I'll explain why.
We talk to our friends about whats on our mind. The only reason parents want to spy on that is because they can. That's like reading someones diary. Some things they just don't need to know about. For example, "you are throwing a surprise party and they see it". Seriously if my parents had that rule, I wouldn't go on social networks, that's why I don't text, they can read it. I call my friend or tell in person , no trace. Parent's tracking my every move makes me feel violated. Like being stared at on the toilet.