No, I don't think is a good thing...Everybody needs their privacy to have a life, if u evade your child's privacy that means you are not practicing what u preach. "Respect"
What make a parent think they have all the rights to know their every move? I know its hard for some parents to understand and to trust their kids, but if you are a good enough couch you have no need to over see, all u have to do is train and make sure you get your points across it leave up to them to make their own mistakes and learn from them.
Now if u suspect your child is in danger or in bad steps then i can understand your concern, there is where monitoring come in the picture.
Your parents set certain rules and if you think you are woman or man enough to break them then you most stand strong to the consequence!!!!