Why a blog isn't the same as a diary

You see with a blog your restricted in what you can say and how you say it. Because people read it , mostly people you know. See because you cant write about things you may want to because they are secerts or the truth might hurt people. i suppose thats the problem with keeping things from people, in a blog you cannot express what you truley mean or feel if that thing you feel or mean is the thing you want to express the most the problem thats eating you up. having a way to express or someone to talk to is important , possibly to important to me.