I read blogs that pertain to me and my life. I read mom and parenting blogs because I am a mom and parent. I also read business, blogging and marketing blogs because that is what I do online.
Sometimes I stray a bot and read funny or popular blogs because I need a break from the humdrum.
If you need details. I only read blogs that seem to be well thought out. No grammatical errors. And they write well.
I read blogs to learn. And to relate. Then I know I am not as crazy as I thought I was. LOL.