What is this blog thingy anyway?

I was viewing some blogs a second ago and wow there's a lot of good ones out there, but the NEXT BLOG button directed me to one which I thought (after meticulously reading the terms&conditions when I first was deciding whether or not to have a blog) was not allowed...porn! Well maybe not porn as in men/women, men/men, women/women having sex porn, but at least scantily clad women that chat live over the page - can this be characterised as a blog I ask you? I guess the term is open for discussion, but to me it seems like a thing you would do in a chat room not in a blog. Maybe its the feminist in me that reacts with disgust or just the ignorance towards this kind of communication, who knows - apparently not me.
It would be interesting to know though, what age groups visit these pages (i.e. all blogs), and what percentage of those that visit sex blogs (as they will be called from here on) are underage in their local area, country, nation..whatever. Is it only 'dirty old men' or have 'dirty old women' also found the internet useful for viewing naked or semi-naked bodies? Or is it adolescent boys? Just something for me to ponder I guess.