When "blogging" about personal things.
Why put your most private thoughts into an online journal such as this? Because you want to be heard.
Writing about a particular person that would mean you want them to know what you think, somehow, even if they don't know your blog exists at all. You want people you know and approve of to approve of your thoughts, you want them to echo and support the thoughts you're putting out there for discussion, you want them to care about the things you do and think and write about. You write and post it online so it can be seen, read, acknowledged, remembered, or so you can show just this to someone at some point.
And despite wanting to be heard there is that tendency to hide your words. Put them behind password-locked doors, only allowing a selected few to share the knowledge of their existence, only allowing a few of them to voice their opinions. Sometimes making those people's reactions a meassurement of how much they care because, ah, still, you're putting your words out there quietly, but craving for them to be found. The more you're hiding them, the more valuable they'll feel to you, the deeper you'll long for them to be noticed.
It'll make you feel better, writing them out, all those things, it'll make you excited to see them noticed, it might make you sad if no one voices a reaction.
Why hide them at all?
Fear of disapproval for something you don't want to be critisized for. Fear of judgement. Fear of being misunderstood. Fear of hurting someone you wouldn't want to harm. Fear of being called out on your confusion. Not wanting to be held to what you worded if you decide to change your mind. Although it's all only of constructed value, even and especially to yourself.
But still, you want to be heard, you want to be remembered.