These posts are great, as it is very important to decide beforehand what type of online presence you want, because once out there, you really cannot go back, at least in general.
I do love the idea of keeping everything private enough that people could not find me or my family, but I have chosen the life of an educator, so that is just not an option for me. I have a website as faculty in a secondary classroom (therefore revealing the exact school I teach at), and also a faculty profile at the university where I teach.
In addition, as an academic, I need to be mindful that everything relates to my professional online presence (and really, to me, also as an academic author). What this means is I do have a friends-only Facebook, but those lines blur when colleagues are added, so I am even careful what I post there.
On blogs, I also love Wordpress. And while I know it is a blogging platform, I use it as my professional website under my real name, for many reasons, not relevant for this discussion (but my own domain, separate from where I teach).
So I have to always think, does each post enhance me as an author and educator? So for me, while always professional, I still personalize it, I still include my own "voice", just limiting the topics to relevant ones there.
My suggestion is for you to be sure you do not mind fans or family seeing what you post, because at some point this may very well happen.
And in case anyone mentioned anonymous blogging (I don't recall right now), I did that years ago under a Pseudonym. It was pretty successful, and I am proud of what I wrote. But, while the website/blog is no longer there, I can still do a google search and see people talking about my posts (it was a personal development focus). Now these were good comments, but the point is that the information is still out there, and could possibly end up linked to me someday. But I knew that going in, and really I would be fine if that happened (although, perhaps a few more years first, if I could choose, so it is connected once I begin bringing out some of my non-academic writing that I have had on hold for a while).
My point is kind of what we say here all the time: own your words. I think that sums it up. Otherwise, what they are is up to you. I sometimes see people using a blog to vent, without realizing it is like writing all your private thoughts in your diary, and then posting them outside for everyone. But, as long as you were writing for everyone anyway, then go for it! Just know what you are choosing.